Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc7c6d93dbcc929…

MALICIOUS

PDF

96.9 KB Created: 2021-06-30 19:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 18c3d9dae992663635e7714718889be6 SHA-1: 9a7055060821e4cb3289e8ede3f8ee658ce9aa1f SHA-256: 1fc7c6d93dbcc929b49b4048f845bbc4174edcee29afb246fc7a0d355735b2e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm hosted on compromised CMS uploads. Multiple URLs point to PDF files within WordPress plugin upload directories, suggesting an attempt to host malicious content or redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160863a8589266---sopurop.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d50da5c9a9---minudesagedumiwirugiside.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081275af010f---sozetisupubok.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0c90bff8586719bb1dc02cfacf5a06a2/bimede.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/72195806317.pdfIn PDF document text
    • http://kasargod.net/uploads/file/rukep.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/junamutezekokutinumijamuk.pdfIn PDF document text
    • http://hrudolf.com/userfiles/midinidasim.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bd9ae99b484dac177e48369c81b53a91/nexedofuruxuvif.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-5/20210505153445239408.pdfIn PDF document text
    • https://wagaskar.com/media/datowezimugixek.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077399182281---3269877316.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/18995919207.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607600bb445ca---xazunemutar.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3b6cddd2f3025f065818643d2cd4af5a/vujutuvodigisenafolatijun.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f1411c7cf---ziwunizijexopularenujuvi.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/v8q6evs1l7d46a6fu8o9f1bih4/8116237067.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/695dee40bb86a4ad836741c4a87e1b89/69109951215.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/zumikufetonafewiwebomigu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fb778a544---63377620495.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a708eb79649---6929927033.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b06271e06067843dbb1214d7191d5c77/vovidolen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=multiplying+exponents+with+different+powersPDF 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_off0001121e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 18472 bytes
SHA-256: 61a73fca56ed01abccfb2e0e1024fdbfc3736a5e1deb053f223793f4e281667c
font_01_sfnt_off00014319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14319 11012 bytes
SHA-256: 176a28ff721eed94c12cb7aad479638ab5d650e2b77457012081a5e8ae3d285c
font_02_sfnt_off00015c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1