Malicious PDF — malware analysis report

Static analysis result for SHA-256 67deeffb2047a24f…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 00:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51722752f70fbe559c28999625ed090a SHA-1: 7ca9f55586cc38d8d28e6cee3d6af751c7aa54b7 SHA-256: 67deeffb2047a24f4fb31f504d0c562ab34db98d99a588248ca50901c4939501
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://niszczeniewaw.pl/userfiles/file/15664236617.pdf In PDF document text
    • http://dichvu12h.net/userfiles/file/dofopaxogalefuziz.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/113af300cc461140b5707f7e70932c02/70199755630.pdfIn PDF document text
    • http://getem.pl/files/file/20508096898.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e989c1410---73452323790.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/34803648809.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/58649975749.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/xotuvevokulotemudiji.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/aumrhonp0qalg3mk0arohvb494/nefapumiwebizosopekoke.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f2a8447b---23076260679.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/23642590480.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/64410872511.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/4128768911.pdfIn PDF document text
    • http://nccutrackandfieldalumniandfriends.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/32575109307.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/tedulibavelepedolejuxikuz.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/77037761690.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ceec7b535cb991ef9b62ce940c167310/31943802434.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/17935690824.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210705/file/58369027801.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d2d1db4a8ebe5bc8a1d930b56024d614/lepezizediwaparidavoveze.pdfIn PDF document text
    • http://expresskaliski.info/file/57686205123.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b7c5094292b1ccd83cb73f0064bc28d2/gugipinijakikopamene.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160970d3682539---sufetaxitisen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=curso+de+ingles+avanzado+completo+pdfPDF 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_off0000e605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 20196 bytes
SHA-256: 777d15c80e773e24fee5b6f69ffe367307da1f336532a9dba92631ce2611707d
font_02_sfnt_off000131bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BC 11220 bytes
SHA-256: fdcb53fafb3a4cc2de9e9804a7b42b810516148cb0cb15806961cb4bfb842340

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