Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16d43e051cbae20…

MALICIOUS

PDF

104.0 KB Created: 2021-07-06 03:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 00b590c63cc1846b54bc465028d8ade7 SHA-1: f380e1e95c88288793e4ec4c769187964ebab78c SHA-256: a16d43e051cbae2050c24a6c59556a4d0f45342a9709199924f33bdc0848f85b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

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://ketchas.ru/uplcv?utm_term=wow+shadowlands+retribution+paladin+pvp+talents PDF link annotation
    • http://cheers-gifts.com/userfiles/74399041590.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/655f166c8a1defa43ed655281ecd59b0/88149214281.pdfIn PDF document text
    • http://indel.sk/userfiles/file/21178419305.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/a5c1f4682914d9e4d95ab2815dad11ef/biwawejezugujulobuwidokad.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcb370e5b3---rodunebegunut.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/63754994278.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/299584797.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b12e161c16---fuxosadotozan.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/lisajusefusenurinorugijer.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/gapaxobuxugi.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ceec233a3---senajuzakefodexataw.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/d9d5c69d1caf1fa8d682d73594bf749d/redaxebifo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4af24cd73---92298175608.pdfIn PDF document text
    • http://peak-experience-japan.com/perusijaxi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/59t94dvqcoi51ce31lohdlukei/todujotoxipinulizupovop.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/19795833955.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/20236979971.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076def97b562---razitonatupe.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78fa43300---najitodu.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/5fc28a869d4aa5b1173e60a7524f3990/40115038623.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087728095eb7---37711739681.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/80924826702.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/kixogogaxiw.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/ramefabakubobekimowe.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a84fb605e28f976be908ad2a0a6016c8/wuwevibedi.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/096b243a1d5cda8f543edde3f1251c6b/69191738331.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 10872 bytes
SHA-256: 8fd7119f6bc3b1adb089d6fe8c97b88042821ac540b4715ef18beccc477ea33b
font_01_sfnt_off000130da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148EC 19092 bytes
SHA-256: 6c7a254a3032f3708c6ba18a5761644e95a7c5eff5b550bc9354396c72a6e30c
font_03_sfnt_off00017ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AD5 16428 bytes
SHA-256: 9a66049359db9a192479010c1ae6da8cc2caafb95fdc55a04734f4df1550e9c2