Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef33760867e7221…

MALICIOUS

PDF

92.8 KB Created: 2021-08-15 16:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a23a07468a143b092d7dada99eb9ec23 SHA-1: 27fb805518840840c5ee7dae355d2f209d090b8c SHA-256: cef33760867e7221d98302bb73eeec0396dc59276d099b74b71e558dc1ca4d68
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to a large number of distinct hosts, many of which appear to be compromised or disposable. The embedded URLs suggest a lure related to technical support or product information, likely to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://garglob.ru/uplcv?utm_term=how+to+replace+printhead+on+hp+6830 PDF link annotation
    • http://caryhigh1987.com/clients/41333/File/gotipitotenotuzot.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/felimuzugamuvidogi.pdfIn PDF document text
    • http://askort.pl/Upload/file/92956245707.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/dijitewexanog.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/32250898037.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/i6d614jtnaeqs6hmt3tcn0pa8o/lobuvo.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/befajopifukowopirezil.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/muzuviwoze.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/81062169905.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/jefogexuxitar.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/cds5lquod0mehts4956u4rqmgc/13237566073.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c411958d0184d35859fc2f437eac730c/befaf.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/rjosjgcsaq6jkbp8tvoaf3fhpa/pubot.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/c9d28c10b4f0a234026700fa794371a6/nezovibufixeda.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/gubejigakudunizufewaminov.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b12fffffc5f880c8b83a91d56d96305d/29998090259.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/gasunonabata.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/20760711107.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/25990269051.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c937b58b445---lebumojajo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c920f3ddf3---70992179352.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ureqk2e7bhb24r130e6m34fe54/86395402903.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/9982d0422f06e49f71410da9e3ba17a4/50165534451.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_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 11192 bytes
SHA-256: 25ed02549a08ab97532290c32efa4d654761cf0f5941f079c8f405aa173fa0fe
font_01_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 17544 bytes
SHA-256: 28ae04de3efd5c5dbf03a2e8cdcb7831188c2966d9439e6346aa11783769dce1
font_02_sfnt_off00014d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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