Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d100105f34d11c…

MALICIOUS

PDF

81.5 KB Created: 2021-08-16 09:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15f957fa081643b9fb204f63a094a2c5 SHA-1: 87380ff6457283b24dbec56fa4c67f87d0651d8a SHA-256: d4d100105f34d11cefd6c532176c1202a82ca76c3e7ff041430ec19509eab64b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are identified as compromised CMS upload storage or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://acrgroup.nl/userfiles/file/59867384697.pdf In PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/15972955611.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/8376802423.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5fed9872---wufowagonuposaxaj.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7dc22dad29804531c6dccab8a43bba28/16161814358.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7ebdc3fb857795c34c9dd1f1a0adf318/15864534755.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/93585491962.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/94086853063.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/wuvebogum.pdfIn PDF document text
    • http://kotolantopeni.cz/file/dozevipupedugam.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/3001bf5c25438dd41251ecddbc77c1f3/tajene.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/tuwadutamumi.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-08-16/815ada5886f71a89c062dad6fcea588e.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/vigipinenamagub.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1d41de22---fobesiga.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/05cb05fd7370738e6e27b5327132fdd5/67810127939.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/zawigomemirovoliraxudi.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/79926283621.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/pefimugiboloza.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/29488746640.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823f6b17326---riburesobiribuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+a+paper+ninja+star+easy+wayPDF 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_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 16840 bytes
SHA-256: fb8e2fdbb332330b6ae112e10be7c9f33f2c9f61698441f925971a92d62d9900
font_01_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 10780 bytes
SHA-256: a71cc12e8f29a636b8926bfd836b2f20b8f713b3fdc2b86e82789518031534de
font_02_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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