Malicious PDF — malware analysis report

Static analysis result for SHA-256 354c352b35b3b3ea…

MALICIOUS

PDF

94.7 KB Created: 2021-07-21 07:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8f4ddbfe7851007d9059d542430e1fbf SHA-1: 127cce2787317a3dc0eb69f5ba882f31277f8d15 SHA-256: 354c352b35b3b3eaab73e49c368921bcb52622ee4649167c7f53f1b61465993e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the document being a link farm, with many URLs hosted on potentially compromised or disposable domains. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fb8ad611f7b4e23530d61d8cb8b8be5a/13926074475.pdf In PDF document text
    • http://bdn10.cz/files/file/43345491851.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/kiwutuzepisazefuxi.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/zavedaxanileroxeb.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d594b3ec457795395f3bc8cde5308762/tulazavug.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/rawitixumadilu.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/pelaritevofadufisotipax.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/64b42b46fe7f31a9e89cace5ee95e117/komilapadepexowisuboneba.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/75950728498.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7910a2a2a---simifutaberopifawelepawoz.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/wozesonop.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/94275080314.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accd9cf041b---1676761308.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/efkskl47r96t1lueve8jrd3e1p/dufajodobazuxikabowiw.pdfIn PDF document text
    • http://candientushinko.com/images/file/tenonopifugo.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/74852624195.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/gjcl1apab00p652gerc3klqhg8/puzedepigukonoxigazajasi.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/lijafozarejotodupofanuvag.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7a373a504---gegagizaxumejofegigarugeb.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/lp9u8rg8ebn56pv1s2k6c5fpn0/5558441670.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a786f74399e---zuvop.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/bafekimapexonosepaka.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/73408932895.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9b16572a6---zibita.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/129c4ed271ca263e3b4d5729b74dee14/bobogifedo.pdfIn PDF document text
    • https://bselink.com/userfiles/file/69726065576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=french+exam+questions+and+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 11000 bytes
SHA-256: a190a482e9a9c0310cb8491b68f3afccc26956985a3c72b4589d9f3db541aa93
font_01_sfnt_off00012694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA6 18584 bytes
SHA-256: feb874d704e6c3e0b8df724e952561f6aa211f4bfa3502ad1dcf6fff6f5580f2

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