Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56bd6ec85b2d110…

MALICIOUS

PDF

89.8 KB Created: 2021-09-22 20:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f51c04c44a3145a2f39ee4d02ad06f9 SHA-1: 79b02ee54f1979aef6cc633eca8ce6a3e7ed2ff7 SHA-256: b56bd6ec85b2d1100047c6a93b224e61b50cdff6b4bc6f8181d49642835928f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://huntic.ru/uplcv?utm_term=pokemon+fire+gba+download
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/daxawunevomexipafupowil.pdf
    • http://elpijisystem.com/file/wonipodezixito.pdf
    • https://samngaimarble.com/html_upload/file/18031285377.pdf
    • http://alfadent-volg.ru/images_uploads/files/fixinizapubowidagefawupet.pdf
    • http://amuseonline.com/absite/userfiles/file/62949647871.pdf
    • http://obchodsezlatem.cz/upload/files/wozozuxeworasoselakezixat.pdf
    • https://gogift-it.com/userfiles/files/pamisorukokugajom.pdf
    • https://akilanews.com/ckfinder/userfiles/files/58760233427.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161401acdc595b---tedegekisaworegupo.pdf
    • http://shippingengineering.com/files/ckeditorothers/jaxapobivofugoripu.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c3a632ba0---piganupup.pdf
    • https://tadimtursu.com/image/files/gukozilizevelo.pdf
    • http://savages.lu/imagesRTE/files/sikuwegukoxofuzavipa.pdf
    • http://gleb777.com/fck_upload/file/fusaneboxonog.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8d6c76e9b---towozedikamebizudewawodim.pdf
    • https://csp-pub.com/stockages/files/83054037353.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e86301fd13ab808b3c7fb6d953836791/dibusanowasoxa.pdf
    • https://activsport.ro/userfiles/file/zeponajapaladazizajibife.pdf
    • http://ajarnveerapong.com/UserFiles/file/79392433874.pdf
    • http://mevlanaasm.com/resimler/files/63354784689.pdf
    • https://rajnnuhiddje.se/userfiles/file/zukulukumumivuxomuxele.pdf
    • http://studiotecnicomaglio.it/userfiles/files/luzewuxolisodozo.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4c33eb662---88026016958.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 16792 bytes
font_01_sfnt_off00010dd7.bin
fd2214f8bbc75086108bfff5d0c38539ed866d767b3168d534566bf8d2531c45
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD7 10748 bytes
font_02_sfnt_off00012656.bin
cc3f8786d9c547a63115c795ebb0848303eb7d7423e42c9ed254906411e2054e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12656 19656 bytes