Malicious PDF — malware analysis report

Static analysis result for SHA-256 790fec3c368b973f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-21 12:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d00296eabae1216e7e0c4121a9b91f78 SHA-1: ec6d16b9a40230097d3445130ba40fcc7498dd3b SHA-256: 790fec3c368b973f791ce9d8e17030499aa03b5260900b8fc65b6c9e0e06051f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing scam by presenting a lure to call a phone number. The document also contains numerous external links, many hosted on disposable domains, suggesting a link farm used for SEO poisoning or directing users to malicious content. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://huntic.ru/uplcv?utm_term=the+oxford+solid+state+basics+pdf
    • https://bccphil.paramedix.biz/uploadfiles/file/soxujajudozun.pdf
    • http://yilip.net/userData/board/file/kugorita.pdf
    • http://musicpark-live.com/userfiles/file/8790189896.pdf
    • http://pc75.net/upfiles/file/1631055221.pdf
    • https://permargi.com/files/galeria/files/8389431238.pdf
    • https://enilubricant.hoakhanh.vn/uploads/image/files/62327773158.pdf
    • http://decamiones.com/userfiles/file/94218208945.pdf
    • http://tahi.hu/ckfinder/userfiles/files/sasorur.pdf
    • https://concurs-euclid.ro/upload/fck/puvasixex.pdf
    • http://werkschoenenverkoop.nl/images/docman/files/3653295278.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ca9ae87b8c0bc2de808178c08eb647b7/vovixomu.pdf
    • http://ig-einheitsloks.de/medien/file/75208137430.pdf
    • http://skrabl.pl/www/rpbd/fck/file/16116263704.pdf
    • http://alda.pl/ckfinder/userfiles/files/87352709712.pdf
    • http://tokyoto.pl/UserFiles/file/zezoxis.pdf
    • http://jatyn.cn/upfiles/202109/file/1631613366.pdf
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/juvazemasavoxod.pdf
    • http://tns-china.cn/editor_upload_image/file/15906502962.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/oqfur1mpr5fatu22fobf0qkjlt/91801868265.pdf
    • https://patoman.ro/ckfinder/userfiles/files/21124678595.pdf
    • http://massimosusto.eu/userfiles/files/xugopatijepadikoxalujalal.pdf
    • https://shreenatharcade.com/userfiles/file/60508935857.pdf
    • https://bevasilicones.in/userfiles/file/42150421510.pdf
    • https://ibliberia.com/ckfinder/userfiles/files/30935144754.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0a5037059d520571d4a63043aa14a07b/luwetujemejijuludefebuk.pdf
    • http://c-amc.com/upload/files/16639384126.pdf
    • https://acavacecio.it/userfiles/files/vubunupubagiz.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/962b28a272acb1367f248110db56ef6d/20020163108.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d4.bin
6374c6f782b8fd4d56d230c86262725033ed58800751e3fe9861a86ca173089a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D4 17972 bytes
font_01_sfnt_off0000f6f4.bin
a8f28510417e930adb5496e266e049c4ec61bf68fec225cde6602dc46f7a9cc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 10820 bytes
font_02_sfnt_off00010fdc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDC 16792 bytes