Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1186d5711afd7f…

MALICIOUS

PDF

92.0 KB Created: 2021-07-07 11:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc1234b04508455accf21289b1f7a84a SHA-1: f21be2416af4f3549004ceb2c91027e53f162cae SHA-256: 7c1186d5711afd7f21ee55ea05296f7c53bc812e0b5a06a37b9efdc7d52f438a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is unreadable, but the heuristics and URLs strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://pcparts.fr/ckfinder/userfiles/files/30351974366.pdf
    • https://plentis.eu/ckfinder/userfiles/files/denoleb.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4a37348c756c3e65290120accae1df4b/8227910773.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ed300dc1beccf1fa77989edc1c439e72/16491518001.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/tek99noanrsqat4dh9vnai5bqn/19596531221.pdf
    • https://silga.ca/userfiles/file/51366369479.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbee05c11a---sofunirul.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/29ik00nfcsbltppmnh6enoiisr/52785711773.pdf
    • http://thedigitalscorecard.com/userfiles/files/56768918733.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/535b83315e41e45df749a90652aacd0f/22171643874.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/a8dbf02092199ab1c57b575091799665/65239808128.pdf
    • https://majorsagilekvaros.hu/uploads/file/bemerekifagomixefus.pdf
    • http://kurier48.pl/files/userfiles/file/debunuwa.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0f82cb27e---dutedemenizipiripafudug.pdf
    • http://rayanchem.com/d/files/22386973429.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68e8f3946a---lojasudijizumuxukekibi.pdf
    • https://anthonygillant.com/userfiles/file/latidojoxapuv.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/mamupizujinon.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d187fe7f3319fc23a4db0fcafd94d01/16111681211.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/62dec2e2a25b2ea552f50ae8d3ad73c7/gudusuxinuxetiwufugudike.pdf
    • http://studioriggio.it/userfiles/files/69128745373.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/i922mnthrt958er4dipuuh57ti/67079055945.pdf
    • https://adsbudget.net/userfiles/file/nobebanogez.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e663811b88---30091199679.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b724a40e6e8---mixukugogizuto.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=piggery+project+proposal+philippines
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010305.bin
630eeea2d4a9f70d5a575de523d356156283ac61ec0c83894c43604d37b68515
pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 17604 bytes
font_01_sfnt_off00013101.bin
de7c8ed77e9e1662ecdd60960218a569ed5b66b22e4f017384833c733132c425
pdf-font-stream PDF embedded font (sfnt) at offset 0x13101 10900 bytes
font_02_sfnt_off00014a2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2A 16792 bytes