Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dba91ff2d5aea61…

MALICIOUS

PDF

88.1 KB Created: 2021-07-30 18:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2358271069a6bb7668d99b41e3313746 SHA-1: df3cfa9c919e008733757d4bc479053a576ff336 SHA-256: 6dba91ff2d5aea615e568f9e2639d399e0fa4fe76d06a8d0a098ef4d2287e78e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with multiple URLs pointing to potentially compromised WordPress sites hosting PDF files, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms strongly supports a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01417f7d1---femigevozeginakafutag.pdf In PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a62bbfe69886a346a53c9d15338c509e/83679846661.pdfIn PDF document text
    • http://metallpress.info/files/50766155301.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c595642a3e5---66741511724.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160872e16d5d85---lenuvikojoxaxu.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/roaq01tiaipk6v7qlpsubtquec/25639177503.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dc22f8b09f3---80082432910.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/a302a7c37f5a171a4a843974d70c1aba/dumofor.pdfIn PDF document text
    • https://cmoretv.com/userfiles/guwezulama.pdfIn PDF document text
    • https://anaksemut.com/contents//files/jelifisi.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/89498756120.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/24590219867.pdfIn PDF document text
    • http://minhanh.com/files/96378111442.pdfIn PDF document text
    • http://royalproductsonline.com/userfiles/file/gijonasetutadatutozer.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff20009a867---75748156333.pdfIn PDF document text
    • https://dintek.eu/uploads/file/9943218223.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/zegomufasefigunijavu.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/nenitijinixutigag.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a97cca279d6---32039160824.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610072b848bef---97771019571.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/wosuvumakemifozudagimifuj.pdfIn PDF document text
    • http://nprofit.hk/userfiles/mibapolabukevivofilogidas.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/15353754599.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/posagupab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+enable+flash+in+chrome+2020PDF 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_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 16952 bytes
SHA-256: 069d3a87b86062991db9915d76ff11b16957c008270caccef5b23520828dbf33
font_01_sfnt_off00011f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F41 11060 bytes
SHA-256: f358cb27f401264293f20217fa504520bd29e81f57075f37006c73e4f50c5ace
font_02_sfnt_off000138e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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