Malicious PDF — malware analysis report

Static analysis result for SHA-256 436120fd437a68de…

MALICIOUS

PDF

95.8 KB Created: 2021-09-17 04:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8d1895c82672a4a0b1566f8838b60f7 SHA-1: 6a4da8a553b86c3c31af9abc7a4d741ce4f3dcb6 SHA-256: 436120fd437a68deca8b3d08e8fc5cd6aaaa0ea692bd1728f9b1df3bb0ad8690
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm and a callback phishing lure. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to direct users to potentially malicious websites or engage them in a phone-based scam. The presence of numerous links to disposable or compromised hosting reinforces the phishing and malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sarljarry.fr/userfiles/file/22157677162.pdf In PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/kibepazepijo.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/tabejif.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/nenanegadaxena.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/53403452493.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/18188614922.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/87499173428.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuwew.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210911_F5193DE2BFBD6959.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/zogumerebe.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/36676188525.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/eb4c8f3aff3228a116c6b8ddccc540d1/76306119791.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/lotakeroxemeda.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/47816661193.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/50158717783.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/nixunulo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/4fa10d0fef022783af881592e3464647/tukonujebowedalix.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161404ead93b06---39109920724.pdfIn PDF document text
    • http://jawarakreasi.com/file/3112266309.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/kozelojidifiv.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/12675111615.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/32497478736.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c38f516079aacc13df2262fee8d54408/47595477676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=is+there+an+adblock+for+android+appsPDF 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_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 10900 bytes
SHA-256: 63ecdc4db73606ab7d3c4a8b36223cf856d6d5cdc5b2e94eb307d48f3e3e0c56
font_01_sfnt_off0001258b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258B 20008 bytes
SHA-256: af6d0acbf772eb960c7d59330020d8de13168990376642594151ce6749f4d4c4
font_02_sfnt_off000159bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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