Malicious PDF — malware analysis report

Static analysis result for SHA-256 1337d62f5e371a3e…

MALICIOUS

PDF

87.1 KB Created: 2021-08-05 03:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f7c25623a0e31c2e267c81981459358 SHA-1: ee08a4c22d5f9a7ad04173ae978698f9008a3d8b SHA-256: 1337d62f5e371a3e5b8d07b44f98439dc28c7056866f9947a7b3b057f2f87e22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to manipulate search results or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO poisoning tactics. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV/ML detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bevasilicones.in/userfiles/file/84964124659.pdf In PDF document text
    • http://timnhanhonline.com/upload/files/76736415394.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/48248558078.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/37672825926.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/93546207373.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/jitejikivit.pdfIn PDF document text
    • http://grimastone.ru/files/94328153634.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/sekexiponivogetoro.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/29297130302.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160853294db9b0---zosanagodozarerogiweluvi.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210702_203841.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/14m7h871ofdthgl4tppl68fv30/romukeludikotunixibusop.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/tufujetovejepobemuxulun.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/dgf5rp4iqp9pnmtf1kq1thb7h7/65869176864.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54c7b28b03---nejikalivonekat.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/rubaxazusotutanelewufo.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ed703ba81---14591857017.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/8736726834.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/98420931313.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/g87sj6eh7vu2op96fr4jf0b4e1/10748864829.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/854a24fcb78c8d31851382266c928db0/natujo.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210608195744.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/11871344633.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/naxaje.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/kimuxup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=xbox+just+dance+greatest+hits+song+listPDF 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_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 18516 bytes
SHA-256: 24b0ce11ca517b1aed052d5dbea016bf47af2ba9a8cc539f336244b1eb582fb5
font_01_sfnt_off00011c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001345c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345C 11128 bytes
SHA-256: e6ff717517d64abbeedeb2f84b60acf06833ab60717b02df09a8544aff3515d6