Malicious PDF — malware analysis report

Static analysis result for SHA-256 53019f06cfec8c28…

MALICIOUS

PDF

78.2 KB Created: 2021-08-21 08:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 436774bb8142ddeec0e98fc5306592f1 SHA-1: 7f27804e241c99f10bd44f5f2cc01941f3178e9c SHA-256: 53019f06cfec8c28afeb61703d81adc2e242b066484a07eeb728b1367443e97e
124 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The file's structure and the presence of many external links suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2898

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://mosjob.ru/images/file/79868395316.pdf In PDF document text
    • https://afra24.com/basefile/afra24/files/vovuguxexonil.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/toxilutiduv.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f23b344a24d---66972805974.pdfIn PDF document text
    • http://nensi.si/upload/file/96013150371.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/9927003156.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/48333126940.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/82450038263.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c312f417a83---26322760946.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863fc698c4e---tirirowuv.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/21539053337.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca6cb3fe7d---naralupalebabipubukiger.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wozesadusozuga.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/6b074c4fb1db7feb1cda03894ee186f1/zawiridixuvoseba.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97d638fcbd---duparipuk.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d369dceac69---nurafoj.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f71e8a70952---83192478010.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9957e675---36914373486.pdfIn PDF document text
    • http://dhf-china.com/d/files/27104219873.pdfIn PDF document text
    • https://andhimazhai.com/images/files/lowakulelonuwexune.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8hup58rdk87mo7jb0m66bubphu/tumejizitedikukipowebog.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608043478b989---wetodefevuvokubitafudena.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb71c9c8998---19273599803.pdfIn PDF document text
    • http://www.agot.pl/upload/file/75938369958.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae49bbb513---bavogelazeduj.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rpnldo72c01ln32ob4mp1i1dk0/57895049858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=tutuapp+apk+pokemon+go+hackPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 17152 bytes
SHA-256: 89a897e47e15339ac4e2343e2503b7e8254935ac7e1f5c7e520229f75010ae56
font_01_sfnt_off00011473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1