Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4aeaef35a30f48…

MALICIOUS

PDF

85.9 KB Created: 2021-08-24 07:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dc4ac2302e29e973eace34bff6c4fc41 SHA-1: 5241513671ede2c3f1a7ad7cbfe90212b0d59ff7 SHA-256: af4aeaef35a30f48c6e185668b9b3213ee00c4c3e86d6d2dc3baed376de5a324
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users via malicious links, potentially leading to further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=growth+of+the+soil+pdf PDF link annotation
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790fb81fc27---45778889944.pdfIn PDF document text
    • http://mousike.it/img_ins/files/86788954652.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc00a5917b---77105613421.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/jiwerawiwifuvuvege.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bb779d9cf3cb843a90df127432972974/nesekojirakuwonuj.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/hds90p6h3m0nn85l9tp41vbbq1/45042702189.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608297b571b0c---xewaritel.pdfIn PDF document text
    • http://xycrusher.com/d/files/40138394024.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/78e67a7ddd1a8bbc3c70f4dfa08e5ce6/62762074233.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/35062855353.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/jiloduxoba.pdfIn PDF document text
    • https://ibextrail.com/editor-images/polixe.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ffb9bda4a---36811105832.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b99f146857cc06eb4332825ce3c78bd7/nepopig.pdfIn PDF document text
    • https://chp-travel.ir/data/file/kirem.pdfIn PDF document text
    • https://mszukam.pl/dat//file/ponuvomilufitegemerebaz.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/1349437852.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ffb20988be027b29805cc2f3a77a9d84/93533939385.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/xedawufegupijuxeka.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b42ee4d7e---50222886855.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/51af2e2ec41a79fc9c376e759d3574fd/57340182125.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/zupuxesuvazonimelo.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/7be3616f7ea9f6e946df519e8055ff3a/vototibolo.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7ab474dd33---kuvivixadakozurixedov.pdfIn PDF document text
    • 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_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 16528 bytes
SHA-256: 5dd9202110f8ef955d8f0eb57c21fd12f80c1e292498b79e432d49503ce3ea65
font_01_sfnt_off00011a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 10452 bytes
SHA-256: 71d3df5479f73b2864c1729e6740d94a8489d58478b67b4d913d5eadf1f544ac
font_02_sfnt_off00013238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1