Malicious PDF — malware analysis report

Static analysis result for SHA-256 0173486de574f437…

MALICIOUS

PDF

91.0 KB Created: 2021-09-01 08:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4270ef032c588e25d3a4d7dceac00332 SHA-1: a5c7b0dd14608cc226b78dda52a7188687b38c30 SHA-256: 0173486de574f437e566c3ecfdd4a8d723a91d849ffde5fa595cc89ab9020fbb
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://akilanews.com/ckfinder/userfiles/files/lukuvujinavesatoxorowuze.pdf In PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/098d4128a368da6262dc3de921cafe31/1761298840.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e48c9ab3fb39de1d2329068570a21cef/92346000036.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/76002920861.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/miwiferaminepevume.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/momavubafefivitebomezawu.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/53210296706.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/jirigazafajoxif.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/givonivofadezitoragaga.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/woxofovadagip.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pamuwowodawemubiroxa.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/nakeroveru.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38ca27d01e9c98ac001679064f18f310/7744792937.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/37173576829.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/5hql42hkl8qat3k3s7o7qskm3d/sawaluselokix.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/nolot.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/tegila.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085e77964706---16341959650.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/vubop.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0801/1c11649a638ecde068b08588ef27a853.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/pefegedusonixe.pdfIn PDF document text
    • http://afro-safari.com/upload/files/zomizovuvokefamimesar.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4bc3727781a4ab9a8cc060fa640b963/wizobetameli.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/n5ejh8rm9kkm3q36jffpbrh2sp/rapira.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/98921779185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=new+jersey+trivia+questions+and+answersPDF 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_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 18028 bytes
SHA-256: 18a410a452f494c5f61f27359152083533d9b232979b0f8114a3d1eae5eaf5f6
font_02_sfnt_off00014471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14471 10816 bytes
SHA-256: ae479c8b0ad58b8b0d4ea4bb8fc9468e33bc429ccca2d68f294887da176b1517