Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd12fcee1ada1d8…

MALICIOUS

PDF

100.4 KB Created: 2021-07-07 11:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 476dfaf7205d40cd89daa3441182bcaf SHA-1: fcafe3759ff48ad9ab311449a33e0dc51cf9549e SHA-256: cfd12fcee1ada1d8b4ed8e0fc57f05bee99c1976b47d27ae88f23e3ca0239d28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, designed to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to use disposable hosting for these links, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://synerhu.ru/uplcv?utm_term=beat+the+dealer+edward+thorp+pdf+download PDF link annotation
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/69013906016e51c246b54892c5743692/39917580002.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/desasinisavorup.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/e60b63qlopu01794cn461c9000/24851291210.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076733190608---87797028781.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/50250739323.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160836259a99d1---82224475245.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ctrphcj8ts5ss5ltvr1b394jut/99773866360.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/69118084314.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/lirufowutixazoxiruviruwaz.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a724f99653---51442625412.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5999a777---xewejas.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/99437121663.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984bc9e89ca---91581148636.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/xiropidagazenaje.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef09c0043---supixaser.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/snomed45nmva6ea74i71gjdb25/lofid.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/zujuxavidepozure.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/bolimogudolabuxolavoziden.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160916edcf0bce---52871984749.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780d08af28e---96563942647.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/kulupesomelixa.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/lemomivolatidovo.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/g6msa59v568jhn94mfhf1on9sp/28606175241.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/70501248068.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/23569691186.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_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13915 10472 bytes
SHA-256: d45283e4d5179a924fd4b11cd2719e7977af10364f1eb9dbab7150d6604e8360
font_02_sfnt_off000150e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E2 18992 bytes
SHA-256: 76af75e3bdc61e07c486ecd563fb59dd7a4cda6b57ad430aa16196afc0a0a188

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