Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d576cdf5e4c3608…

MALICIOUS

PDF

73.1 KB Created: 2021-09-30 14:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8d0d0add000f62dbfb361232144de52 SHA-1: 318ffb06850a695ea06b002867a9fcfa88dfa1ad SHA-256: 9d576cdf5e4c36088654b26cf78e4bd813c9a7531b69289fe287f8124e84c812
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics suggest the PDF's primary function is to lure users to malicious external 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://philabc.ru/uplcv?utm_term=how+to+keep+pictures+private+on+android PDF link annotation
    • http://ylgems.com/file_media/file_image/file/59421906697.pdfIn PDF document text
    • https://cope.lk/assets/media/file/76587165451.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/bivofafula.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/sukikibagefivufenuwefat.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140029f75f89---xarokuni.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/lotofinifisa.pdfIn PDF document text
    • https://kermanrooz.com/img/files/favutotodogipazede.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/19452436205.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/36320857375.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/6415679666.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/68172427271.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/62886271685.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/3g94r5pn2ho4i7128507qac0np5tfjfi/9885031700.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/zejuxug.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/brdu36nkool6rbsnkim9nnsrg7/gusuregefopo.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/91451561942.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210923124448016752nfomi3.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/92384528799.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5tkt64jlh762tsksdof4pbeb1c/30381714232.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/kepagevukuzifunumijowedas.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_off0000b455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB455 19128 bytes
SHA-256: dd3dea855f5531d0a49fa6d8b057e92b6d668480e1e70acc9d7a478aa0f8b8a2
font_01_sfnt_off0000e574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 10796 bytes
SHA-256: 293a0877239c127d9d3f4a4536ad6b9cf2421442e41fb3f539a52e2671c7f1bf
font_02_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1