Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c9cd900579a9ea…

MALICIOUS

PDF

101.6 KB Created: 2021-07-04 14:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7c9393c03f17f3b31eac98d19eefec3 SHA-1: 938341d662ef444194a55a6be2a2f3851ae92dff SHA-256: f7c9cd900579a9ea465087ca60ba2a315043aabdf94bc3b434aa5802d5d44e45
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous links and the heuristic firings suggest the document's primary purpose is to act as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 5

  • 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://crysiq.ru/uplcv?utm_term=wbfs+wii+games+download
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4c6b7a14aad46b5d0fe36472cef3551e/32635670503.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607289655df9d---49859146492.pdf
    • https://hyundaia.ru/userfiles/file/69924627405.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80174846a2---sokedugasizidurulugusizax.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a868ca8d1b6---fivunewakiw.pdf
    • https://aromamarketing.md/img/files/32200619028.pdf
    • http://dashoernerboot.de/userfiles/kevafuxen.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/419ada19635ac3d220e6e1b5f520554b/50453990818.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fee1254561---falazonuwogiviporop.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/43h0l4i3dj1rfpngf5j9fdo8bh/18263620546.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/d35fa92be26932255b949ddfc20af991/kejisewan.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609730c931110---35732964329.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b230708e4---35853148310.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc3ff7fa22---xifowimajunaduwati.pdf
    • http://bidwoodmachine.com/d/files/rosogo.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/7bc04bb463ad53ac7d7066ed722b613e/lutigukebazizej.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/en0bljppf4n3frdfdhdhk35c3c/54927058274.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3966d27bd54e66f06077197f9d35ba2a/10147600908.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/27e07d9beb5f80b365ca4ef41758cebf/1968909561.pdf
    • https://toppelletmachine.com/d/files/zuvekijamujowa.pdf
    • https://szabobuszberles.hu/files/files/divudipodevawolujaror.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/xosepasux.pdf
    • https://securitydm.com/slicice/file/nebijaxelipomibigake.pdf
    • http://bearings-home.com/userfiles/file/dubitewagizu.pdf
    • 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_off0001292d.bin
d6a1ce6296c093d941cec5dade257b0cee741ef4bc0ee05caa96113f6d8c22d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1292D 10720 bytes
font_01_sfnt_off000141a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141A0 16792 bytes
font_02_sfnt_off000159b2.bin
913e8d0157cba53840fe52f11766e6d6921be9f89253b4168ef0e89c5f19e0b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x159B2 17784 bytes