Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c536e689f7d8cb…

MALICIOUS

PDF

84.8 KB Created: 2021-09-18 21:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90c619844aa6388b82346a8695b50cd7 SHA-1: 45302a4aa1cbb96f06e096f1664d161190e43c92 SHA-256: 57c536e689f7d8cbe595e41a3bafa3942f5551fc4a29e31263270d3e1666bbac
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, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://villanakarin.com/userfiles/files/53289024466.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/qqqlr4ub85uerudpbk20pnhh8s/worituzitaku.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/58107219037.pdfIn PDF document text
    • http://93564497.com/userfiles/fumimogepolotozidozupekos.pdfIn PDF document text
    • http://oris-am.com/editor_up/tofuropiwiratib.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/76251797796.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/zubafekogamurawurevavuz.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/4930984721.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/25365855313.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/siretatego.pdfIn PDF document text
    • http://temple.mo/userfiles/file/35761677679.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9f60dfb0---71641803318.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b618bb60---17411919378.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/22962107870.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/lalapulaxeke.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fecdd2da0---53771787771.pdfIn PDF document text
    • http://hflchw.com/upload/file/64668559111.pdfIn PDF document text
    • http://afro-safari.com/upload/files/67577703373.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/84512914646.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/17693981322.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613025185b3b5---radozigopiravi.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/92789432891.pdfIn PDF document text
    • http://sparkpro.lv/content/file/19073004222.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138a254d8a38---gumawuragajegalokoriwilap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=carrom+disc+pool+download+apkPDF 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_off0000e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 10656 bytes
SHA-256: 915417057df59a4269c9fa60d44fdda948f9bb0d5e23b38a2f319ed5e1db9f3b
font_01_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 17812 bytes
SHA-256: 23f8e81dc674507494467e3cf0ff8ae39dde6de0b55c1ce53568cad8df1995e1
font_02_sfnt_off00012d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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