Malicious PDF — malware analysis report

Static analysis result for SHA-256 41591afec920bb6e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 05:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 922725904ccee880eb38e6371fe9bd6b SHA-1: 0e1de4c0a8c8e14b64964cb70b1a6f41f142bdd2 SHA-256: 41591afec920bb6e19b13355f85bb33a0b6ef687e1d2124e5051a0d4f41915c6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs and link farm patterns, suggesting its primary purpose is to redirect users to potentially malicious websites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=list+of+debt+free+penny+stocks+in+nse PDF link annotation
    • http://df-foundry.net/d/files/4368804181.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/winagiw.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/6367d9f808d01d02d0ae10ca5ffb8fae/99925578301.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/77463797132.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/55cf76c8d80e36ae8d709a5c4591b409/66770766316.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/bagimoxowaxobowudokibup.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/veduzasoxiwavopitopanu.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/buxewiwobavuturid.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ba4643673---78806030299.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e64546414f3eb724df0c956accf271d7/40412895655.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/71ed7be5a6c307cb65f88405a784d34a/jadujawebuparojole.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/favewidifezezigav.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/1244380736.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16071a5a81df1a---53739902425.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fef8475cf4d---21462803911.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bcafc5f12---wevezigowewugudivak.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/19229332858.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/71018845923.pdfIn PDF document text
    • https://granchefpremiumfood.it/file/dinezutedibojedesirefozo.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/84484899161.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/f74u2sum7nvv985l2btei4lok0/56370265028.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d8114bcfc---25608726600.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/kadorapowesolado.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/mojesuletiledija.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/sj0sqpmmuj5oa9p7atofmppu57/38838949815.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_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 20056 bytes
SHA-256: fdba36a71df7557ea3a64db65441ba2f023ef5bfeb38800688203c53d26727c4
font_01_sfnt_off00011636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4D 10708 bytes
SHA-256: b9170e8317d5b4ce4aafcc0030a337ffa8c02a2323536af13a25e1ac27a51793

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