Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e9c717591b77d8…

MALICIOUS

PDF

73.0 KB Created: 2021-09-08 00:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 28e84cc8ff27db8000cd8f846e138df6 SHA-1: 04a7c328b15002a406acdba4183e7574ce30a1f8 SHA-256: a4e9c717591b77d82e4869f4ac8d92899a54f8e5e709a904d2de7dc9e330d695
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and other domains hosting PDF files, likely to distribute further malware or phishing content. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f9ad1090f9b94dfff192edb3b839640/36325086160.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c0286e66937a3aa09efbefa7600750c0/sarojogawujizifi.pdfIn PDF document text
    • https://istanajp.net/contents/files/65356811759.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/76736415394.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/71447305811.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090722563373499.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608456c7c8a0f---10741231713.pdfIn PDF document text
    • https://avvocatoboretti.it/file/45502825084.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/gafatezolofan.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/luduvunowuwazewi.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/93774742800.pdfIn PDF document text
    • http://zamgph.com/uploads/file/282312438774.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/56020023920.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/u6rp9mbrnek5js0nmmt33djv06/jumanofuviripeti.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077975074c53---xirukifakesobizaruze.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gtsk7q2ms1q7uis3j34193u7cb/48379147329.pdfIn PDF document text
    • http://landtop.com/filespath/files/20210816085350.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/42459577001.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/furabalatufamezawakaxevav.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/50909579752.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/62875372742.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/lemejoduziwowa.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/32294971298.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/86924037636.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/26149795546.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610a293495225---poxumepusoworifabejuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cfr+21+part+110+pdfPDF 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_off0000bd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3E 10156 bytes
SHA-256: 3be9d2a07589b78ead5f860593f5ed672e9b623e2cc70922e8ad3f8dfaa987b5
font_01_sfnt_off0000d425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD425 16368 bytes
SHA-256: f5d6ea65d422ceaaf5deea9a8a5403df1d65b888020dc232d48cb5291ef8e970
font_02_sfnt_off0000fe57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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