Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4656f909e79fc1…

MALICIOUS

PDF

91.5 KB Created: 2021-07-17 04:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 7cd5d5c77dfd100197a5bcff2878b764 SHA-1: 6565fcc4f8edc3be4c2c439895c7c9fcf1603339 SHA-256: 3e4656f909e79fc1e34f797a53a2f57242392de563a95c2eeb87426b7958a4b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, indicative of a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://dynamicyunnan.com/ckfinder/userfiles/files/rijokutegidejadotapata.pdf In PDF document text
    • http://aliglobshop.com/userfiles/file/regonidizeperoligijaj.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083607e61105---44598838554.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910c84d49a6---77637944464.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/zulekinitiwelu.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/pigokagikatuninovivexo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a9a887e72---14083850001.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608815ab3dcd6---65250781013.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/zixigogo.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/vanososesupukav.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/2ml2hpb00g00c26h9gtth6tgk6/kuzepinukeluvuda.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bb81a23a1---zikilurudipalemelimuzazi.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747c089033c---pivul.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a5kp2u91nk35te11g463irk0e4/56910967136.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f91eb17a8de10b340aae498fd12b55a6/wigudo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/54e29a679f54a50a4a31f4762f3c1386/36107956178.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/fdfb8358b826f3f6cd9c20bde45dc8d5/22358138772.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160876e08455e8---wazowe.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1db37cf29c91893416f58b2c96aecd40/zefovewojedixubaga.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/11ebdceb26d73a6dc9bbe79129fd516e/volinapivujegukox.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/mazeleguveruwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=direction+cosines+of+a+line+equally+inclined+to+coordinate+axesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 19728 bytes
SHA-256: a9dd4773ec21d82f7ccd4d76a480e408bb5e65911e6ed0ad0aa94732942842eb
font_01_sfnt_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 10932 bytes
SHA-256: 22936e159abdb51d190fd93fc06da46ef0430b4b5abecf7f0c656ffc0de62758
font_02_sfnt_off0001325d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6E 16144 bytes
SHA-256: 1bb543891201b86cb218c82ce0c1e431878b85d3145a79f40ea94bf38162e691

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