Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cc175af278a3e2…

MALICIOUS

PDF

72.3 KB Created: 2021-09-15 18:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f626b0f5180dd4673c42359ca23b19c SHA-1: 3bdac0b8424e959b141968a1f0816c28fa9dcb28 SHA-256: a1cc175af278a3e23f5a0666ff0b9b151e4dbe5426a34cbe55a885fa0b977773
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics indicate an attempt to lead the user to malicious content, likely for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://doellefjelde-mussemarked.dk/images/newsmail/file/63978284597.pdf In PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/nifamexolelep.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e312dc63d---90353844294.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/geset.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139719badcd8---93532410814.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/19605112212.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/92785252957.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/vadamesusomizedoga.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/93971796595.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/29651693386.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/wenisegejokopo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba1bbb35b2---8173021109.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/wulimofu.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/2341644317.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/kunizajaxuzejivakadafit.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/wapunopumesupaxozira.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/kojipakugone.pdfIn PDF document text
    • http://voijin.com/userfiles/files/979728935.pdfIn PDF document text
    • http://devison-matras.com/upload/file/79323210437.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/68497540834.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/66507907088.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4b7a2420---wepobotalukowosirof.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/29766419331.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5a3a3ae---94371670357.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/pirilawamunob.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136fa4c9789f---31140483731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+long+can+thawed+chicken+stay+in+the+refrigeratorPDF 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_off0000ba01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA01 15368 bytes
SHA-256: 84d92c7e5f241fc4ea0345181af4c4a53d9cd4ed1e3e6d489b3858f463c81a43
font_01_sfnt_off0000e161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 11040 bytes
SHA-256: a84a28d18aaeb7f3fd17d7c99406281eda1c2b06e0a5c79eaf27950d22a014bb
font_02_sfnt_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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