Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d6c168eb8aafd7…

MALICIOUS

PDF

85.8 KB Created: 2021-09-09 00:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a453c20734750e81d7d7a473635ccde SHA-1: 1f83661c1915b68fabdac0aa58ea3f9d1a17bb83 SHA-256: b2d6c168eb8aafd7ec4d818b40e971e1eff6d16255f3fc426fc941ef1b056043
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The document's content and heuristics suggest a callback phishing or tech-support scam, aiming to trick the user into calling a fraudulent number. While no scripts were directly extracted, the PDF structure and embedded URLs point to a malicious link farm and potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.greenfield-sustainability.com/images/files/gazozupubomagel.pdf In PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/radegutakatijegif.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/debuzo.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090710473018.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/fotodupixesitafozewariver.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/43551876135.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/felikulozupajojaje.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/tobebaneb.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/kawilizopajude.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/45462449.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/15954242487.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdac17d4e0---janalagukukasig.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/11822303731.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/bikojakujarazisumoxiza.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/joresowovomevajigosoro.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/69936d0423a263df466235de6034f01b/vexenidojivasimeloluge.pdfIn PDF document text
    • http://fullx.net/files/50298494597.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/45700578576.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nirenuwa.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/vurulux.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/ralesanoj.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/58928209773.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe825c038c---nojudimipamulafus.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4f12ce46e4784f2bb3283a29cedcf935/kurugigutavivutudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cheat+codes+for+gta+5+ps4+numbersPDF 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_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 11412 bytes
SHA-256: 33ba4fcc6fcde1893485e0900acbbf08404d73c7f3a9a1c640755a4de7919e8b
font_01_sfnt_off000101a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 18256 bytes
SHA-256: 6726fddcb322c1a51ccc4d0791ed35e86f3e8a049d1fe4ec821deb6ed663b1f8
font_02_sfnt_off000130f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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