Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc519f27c7d8de5d…

MALICIOUS

PDF

79.3 KB Created: 2021-10-07 05:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a603516ecddd6b1e19f058af91c8d803 SHA-1: b0957842ba5e0b557119fe33e7ee200a35a14f98 SHA-256: dc519f27c7d8de5de33064f79627235607c304d98a28cae4a5396127aa7db241
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm hosted on compromised or disposable domains. The document body is heavily obfuscated, but the presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the intent is to redirect users to malicious sites. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://irlanc.ru/uplcv?utm_term=brindle+pied+frenchie PDF link annotation
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/316ffb00f90e05c67a43c47fd596379e/47945919298.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/50931516283.pdfIn PDF document text
    • http://glttek.com/userfiles/file/rokinigokegowazesenari.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/b59598cad27d39b68dcbb0a90e4c8047/45658211877.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/buzaredomabuvebo.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/98085455054.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc58c0636b---32599396747.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d8562a7b---nesowiromagaxedusipum.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/zoxawamuvana.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/vuxusumudajidomaninuxoj.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/69487037081.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/86538374896.pdfIn PDF document text
    • https://gencatakan.com/upload/file/kisalapimevaxutesupino.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nbq1h7j813obnao4hiqmmjs66c/gomomemolinazutofovos.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/zetusut.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/74974168870.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/57112102312.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/furigeri.pdfIn PDF document text
    • https://computerzone.pk/file/63162041367.pdfIn PDF document text
    • https://e-room.co/userfiles/file/buwiwavirodimutovi.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/mizuvomutukija.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/355236863.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_off0000d3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BF 17416 bytes
SHA-256: 010e2fba97f5be46168fbea6ace48164ea2ecec8a980b39f0f91ede4183269c9
font_01_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001187d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187D 10220 bytes
SHA-256: 991a1957dc298a2f03cd43a4e0b297fd0f5eb699d107acdd312ee97e930f0f5d

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