Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2682d9504439741…

MALICIOUS

PDF

92.6 KB Created: 2021-08-06 02:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: b7a31c5b58096c4a8f29d21102b67bf6 SHA-1: 640beab0afbf757a024a02734cff7e1480705c9d SHA-256: f2682d9504439741d59c52c96a62c13b9ee53ec2cd62e3736a51e6daf615ab80
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and compromised CMS upload links supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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
  • 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://cructi.ru/uplcv?utm_term=relion+control+solution+level+1+range PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lku6j5fjakqj90mdffojtlvh7o/lijorujokilesinebe.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/nugisuzunafunowof.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ghk87478ojnvtf5hb5apcjv85v/miwuf.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/94864937338.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/4ca536efadce4812489377b9c09d398c/fixafexajif.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/kibulejinubenomozukovi.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926e00949cf---lasekusodusifurakodu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4853de46f---bebawoxerasov.pdfIn PDF document text
    • https://bamor.org/userfiles/file/kigakojomudomajex.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/17112725932.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/99692915727.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/16421d5c9d4bc5bd451ed969c85dad0a/bulexanerinoxuboli.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/64445032027.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0702fb9083---sovinopuradunazin.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/nasogotaro.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091987b52c01---97562416624.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161026e8815e26---susodudikuwuzanefoseg.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/9b37acbfc13d9861f4644f8ad6b82723/gimiwisaxorolunaja.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/bg9a5l7a7rqsb547q87uvpbj2d/xizujorufisufuki.pdfIn PDF document text
    • http://fittbike.hu/files/file/kogililulo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f0a9fa0b---xuludarizusufifedap.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/4616ba4182364f21169e367f9b12028e/1330331106.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/0lqtifi7a4h2oh6ik6b0n22j4j/bovenuwulezebabefekobitaj.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d3eeb9af9---nilobogojata.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/dbfad7a3f317c7ff8d0c8b30a167af01/6330148908.pdfIn PDF document text
    • 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_off000101ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D1 10668 bytes
SHA-256: 47216aa6649938f7c63a6b6e48af5f855bd40800cfea4e7554f42966dc2cc6bf
font_02_sfnt_off0001327b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327B 18000 bytes
SHA-256: 2a7ed38d657bff3ab42ddb3ef7fd79ed9939c029cc602e04fec5536b814640f4

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