Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b522abdd7929e3…

MALICIOUS

PDF

78.0 KB Created: 2021-09-15 19:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f7e4c3620c8945a9eb5eddead62da50 SHA-1: 5a2d93c7760adb84af6fa6f2cd7dce26da55cf2c SHA-256: 40b522abdd7929e3eba1a40bfd720b9af5cdc3ee60d4b73dcf7dce99ac70fe93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://oniceh.ru/uplcv?utm_term=wwe+immortals+game+apk+download PDF link annotation
    • https://korovin.org/site/img_ufiles/75135280212.pdfIn PDF document text
    • http://knauto.com/upload/file///rotuvegosukanipadugef.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/webewu.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/rusabo.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/65191171051.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/82663238986.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/rabeze.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/90268063262.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/92883126740.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/pokamejif.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/65705058301.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb97e0311b---70484934678.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418ba7f311c---18999876422.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/97678963917.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/xelufiwe.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109041548351746.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/lalikikevonitazadadal.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/lotosijepoteta.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/4203453516.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/26642305445.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/fabupidobebifugopat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a39f27b555---74342246464.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/33330145608.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/fozit.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161416498c35d9---59003006065.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_off0000cd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD78 17048 bytes
SHA-256: ba2d8e73532ee7ec52297f8f1efaf470ba7f431103db462487ec20c22a04821a
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 10908 bytes
SHA-256: d55cebe03adebb8c38c5f110dcd8647eb1c123a5eea900e847ff212ceb3de27f
font_02_sfnt_off00011264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1