Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc80b0881f62f42…

MALICIOUS

PDF

87.6 KB Created: 2021-07-04 00:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d759a47e4a4531c7b8a089bd8d0b08d0 SHA-1: 32213e7c77df9eff58517f3b422a513695c95dc1 SHA-256: 8bc80b0881f62f428812fa3f25193fa8e2a546ee7f830f8ba8a18cb45291e034
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits multiple indicators of malicious activity, including a high ML classifier score and ClamAV detection as a phishing trojan. It contains numerous links to external resources, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and instructions for a password-protected archive further indicate an attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q35rlfadk64eqpt3ld03qb5123/42282760744.pdf In PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdfdfb5e0a---68822939011.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/lisanigenufumezamevumijew.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfde3b57ef---1346601096.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c93aa51bc3---mibirenaxabuzipupufat.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/317e7cbcd6bac8b5747028f476f495b9/78888038947.pdfIn PDF document text
    • http://tfforming.ru/d/files/zedajononusej.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6b80c24dcfe4d78b0b0cf35fb80008d2/xugonexadagutudog.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d609bfc89---vabutolilezeseligopuz.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8ed874430fb8e4ab2db33e8f8cc465d1/22636024628.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9a800d7c---leluzi.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210630152302_nfjvm2.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/kipirameferadirozikanowux.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c6b966c3---96052626381.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kejonobexoge.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4i3bmcvujod6k609n4ks9fervm/52003099795.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0bd28caf---36059161824.pdfPDF link annotation
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/joguxizalusinil.pdfIn PDF document text
    • https://webmenuplus.com/images/file/2519485751.pdfIn PDF document text
    • https://sealskinz.ru/files/file/39446649524.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a616826db69---16715314349.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fab35d619---77655823186.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/bizokedib.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/rifizil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+wwe+2k19+iso+file+for+ppssppPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B79 10912 bytes
SHA-256: cfe07efbc7adab001c0935b2e440530f89e2f92b98ac9bc6962e1f30dbf2e2c3
font_02_sfnt_off000124fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FD 16996 bytes
SHA-256: 37b5c8e77185cfd2a421dbb3b1dde751e90b8e8c2960b9454557932cb510bb5b

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