Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bb481778dcebbe…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 10:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff3a35e123ff8b32449d1160e86a64b4 SHA-1: ef84da411acddb112a1bbcf065fb314d897e2c46 SHA-256: a3bb481778dcebbee4b230036a4533a999987fba90088f628a3a523a51cd5d2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external resources, many of which are hosted on domains that appear to be compromised or disposable. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading further malicious content. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://abbeloosschinkels.be/userfiles/file/tijubogepekofitojan.pdf In PDF document text
    • http://aesg2edcv.handylover.com/upload/files/49895927906.pdfIn PDF document text
    • https://gilbertems.com/videos/file/43819138199.pdfIn PDF document text
    • http://hydrem.ru/images/file/nafaluwix.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/59692070995.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/80460787168.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/cbn1jho43cu1936q4fv368m79i/30371777497.pdfIn PDF document text
    • https://dintek.eu/uploads/file/31263309363.pdfIn PDF document text
    • https://ottopianos.nl/files/48907018111.pdfIn PDF document text
    • http://standardamulet.com/files/files/vufojos.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/60567747617.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/puterojar.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/68775880508.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/nefazav.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/t5u8argi62h93ji4lb1u0q0mj7/25680841028.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/sawedirepalatomipasurup.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/40229784420.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/ramuwe.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/8392755154.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140373b07394---20306859191.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/78539578658.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161393b036d6d7---56125059430.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/37915702750.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/mokunaxadijasoretoxetem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=smash+cops+heat+mod+apk+unlimited+moneyPDF 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_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 11060 bytes
SHA-256: 51a11d152ec754f1091962a0bba8c57fc52165a2f304bf1fd5cd309087e0657d
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 17928 bytes
SHA-256: 7cdbbb698407ad8ff75e34c387de025042a401cabbf66033d1ddcdc06f47c3c5
font_02_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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