Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4d4d0b4df16dde…

MALICIOUS

PDF

86.8 KB Created: 2021-08-26 07:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10510505b67cfdf5f0dee727d59512fd SHA-1: 6a611844eda8b6213ac53f67bf563f76e598b3a6 SHA-256: 1c4d4d0b4df16dde613973f0d7745812fff11a94f456359250b73113acec3f3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to other sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to compromised or malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://inwebjor.ru/uplcv?utm_term=come+ye+sinners+lost+and+lonely PDF link annotation
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2623f83980---44827511335.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/71127305598.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/72848433504.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/40388188095.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160773a293e377---58125637514.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f319e9d10728a830fa9d4dd06c594b13/gogosudugekafowujenamu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/438b8ef77136f55b7a971db339c2b7ba/luboxakurafasu.pdfIn PDF document text
    • http://fittbikese.hu/files/file/67259177130.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/55062261169.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d7cdb3aff7bb3cabd16f908b628f79d1/dodubiriborufejine.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/gawaxubofobunij.pdfIn PDF document text
    • http://gptools.net/userfiles/file/1426729814.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/womeposizudi.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/48498614203.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc45c8a823c---wunewu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae1191cf6---69688501824.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/gufawuluvexitakalazeni.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/79015015280.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e003be7c---defuwereg.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/bacd1375fbe8a4af98c9b14a096af71c/xafimeruxujuvivorolezope.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/60663821281.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094525398b1a---72923323395.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/puzikaruxavoxupiwaju.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_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001086b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 17944 bytes
SHA-256: bb673a5daf1c1cea9f921661ace7d106ceba9116b4d143ac46c14931b481e4ce
font_02_sfnt_off000135fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FC 10552 bytes
SHA-256: e2d3a8a7450ee4cd20cf88e839678ab4b8451e097368e88f2dd8bcf946375568

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