Malicious PDF — malware analysis report

Static analysis result for SHA-256 916628e8e55d6857…

MALICIOUS

PDF

89.3 KB Created: 2021-07-20 16:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c209e4e0a3a85606472f6ba4fecdf30e SHA-1: a81d329e0134dcd6ff876ab2afda7ca1018a6ebe SHA-256: 916628e8e55d6857b691e6392f18d8f5a2a9f550f86d80aa3557cd8c67b2d43e
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://lumieretvie.com/userfiles/file/xowufolu.pdf In PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609009efdaf83---sipuxulixov.pdfIn PDF document text
    • http://brukbet.com/user_images/file/98218815039.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/3f7f529984b304d3057956525aa1cf10/mifuputabifomugadeju.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/liriwimonopa.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f15c0369c4---rodepejef.pdfPDF link annotation
    • https://susta.vn/userfiles/file/77294837955.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/lemimojagenuda.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/26704634480.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1694b7130---wikidexuxujolixilumo.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d795ad7efb14df45922b0a8e3e792807/fovaxemafijitefibifoxozo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608289c6943e8---76283686031.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/lixutogafemipotomotivikoz.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609a179e84ab4---47622123455.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e62bc2169a---wititutopuwosiniz.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/emagc6fqo65p75nuk7ha44pnso/39696489327.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/95281296493.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/dajovosinafoj.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/xuwarise.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/rezamasofisekoj.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30c92aa373---44548131111.pdfIn PDF document text
    • http://surtek.biz/image/files/20150205_050255.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/zegatekovumovutesogoxup.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/rosezurasipapepewime.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0459822e9f6ef2260999109b884e6428/51402134200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=windows+xp+sp3+bootable+usb+software+free+downloadPDF 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_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 11084 bytes
SHA-256: 8e2efbbc3de1ecf2d65e8bf73627b849a4e2c776de8b50495a756cbf21604cde
font_01_sfnt_off000111d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E4 17356 bytes
SHA-256: cd99743d36acd5ba0df07b61b2decb0ab529364b76c35bea344503075dffa3eb

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