Malicious PDF — malware analysis report

Static analysis result for SHA-256 b867ba2f0a47665b…

MALICIOUS

PDF

90.5 KB Created: 2021-09-13 23:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1db0c9ca52b4c5ff374448d2bcaab70a SHA-1: 8ee4fedc02d80463aeb34175ee87bed2201dd674 SHA-256: b867ba2f0a47665bae02d3beb85c1489635af64964e9309b88a4773c2663e450
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to potentially compromised WordPress upload directories and other domains, suggesting it is part of a phishing campaign. The presence of a callback lure heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or fraudulent billing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://klick-tipp.info/ckfinder/userfiles/publics/files/68396252921.pdf In PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/35318616573.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/wokuwagabirefigef.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f0de70df6---26640134408.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/kolifulivegivo.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/54962288174.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/49217753427.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/tivevutajixi.pdfIn PDF document text
    • http://www.siposferenc.hu/html/71042384315.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca1cdaf0d---66711385585.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/kulepojo.pdfIn PDF document text
    • https://wasael.com/userfiles/file/ligogatafasitekajus.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/jolutiporexalozanulogi.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/37351193891.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/peverabexikigadanud.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/16919553290.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/21748964425.pdfIn PDF document text
    • http://apart1day.ru/file/20107281159.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/44058506598.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f7337e017---sadikunagupagupigin.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/86468058554.pdfIn PDF document text
    • http://byecook.com/ckupload/files/mejof.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/63439005174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=r2r+client+androidPDF 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_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 20080 bytes
SHA-256: bbcc72f1adef4527c018a662319aeef95e7a43dc7b995236cd5d5a5de7cf6903
font_01_sfnt_off00012cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14506 10360 bytes
SHA-256: 0029db0f5d27dc5b4716eb9bb1ab608e671c4835570918986b8e2d621de810a4

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