Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ea050c5a7068c1…

MALICIOUS

PDF

96.0 KB Created: 2021-08-01 11:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b29c025a31481f8be2804fac9530fe04 SHA-1: 540634bc59a3df4ffa248f806abf7d5ef284ce5a SHA-256: 81ea050c5a7068c17ce7347bf70aaacd2f59f1cb9937b2ece13164e8d2accb86
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e4bc2dd24---jopijaxozura.pdf In PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/4db8bde2695abb651198e1911c37c14d/459853646.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cda058abd34---zisexelixedexavevu.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021071415370573499.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/6f8649bbe9d30a74f7a729bf81cf8d5c/dojiseliz.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/wubapumusufe.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/71293953462.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/lagezasalizitovomabinu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/83ji602tbe83k9fh9tbqej7ls4/45187135997.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/2gmeehad7jo32lvrd5a9j37h8v/kosovifipugowobuduliba.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/wipukobefi.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/95d6feecaf0c6b6a04cdfed0459c42b8/vosasuwikuserosuxigi.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160736893e8d02---pajos.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e44863ba18bebff83c7c245c9ce1de6c/dumexoso.pdfIn PDF document text
    • https://go2germany.ru/files/file/menizur.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210719183107.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/zarirajija.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/73736534542.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/demexujazutebokakudep.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/letefov.pdfIn PDF document text
    • http://mqskin.com/luutru/files/50163197854.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/xenizosi.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/04kd4br1dkl08l2su0m26i1bft/32514294877.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/tupebesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=motu+patlu+cartoon+video+hindi+download+mp3+pagalworldPDF 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_off000110d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 16996 bytes
SHA-256: 4497996b31790dc3d688db7c268b675471e34634ba4e4857aee22442e494b271
font_02_sfnt_off00015551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15551 11208 bytes
SHA-256: 5a0b80b16a277c9ddc126b7a8f06755c0d391763fe0ad0fc32f2935b0c0eafcf

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