Malicious PDF — malware analysis report

Static analysis result for SHA-256 156e0c5736011a89…

MALICIOUS

PDF

87.8 KB Created: 2021-06-28 19:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 848bea0ad3a2a710efbabe09a2d9842e SHA-1: 15aee111ad1f792ebbf8c21f6bce35826e04250d SHA-256: 156e0c5736011a89d0fd5cef6560366845348051622b173227160a2be193b4b8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the structure of the links indicate a coordinated effort to distribute malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/bf4d283925864cd5459eb3ecb2a3e18c/90631637965.pdf
    • https://sankohomestay.com/userfiles/files/pipagikenefitomifedum.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad18996bec---35664942754.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b60e4ab283---rukosajanagudi.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8nppshphq9s82ef677ue6qrdq0/29603432386.pdf
    • http://capmar.eu/userfiles/file/fiwujepinikilonumuwi.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c652cb52d---2450301012.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be93bd9f5d3---siwifaku.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a088f440d90---dojabutafogimatolipin.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zonalotu.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/34787cd58b2194604fa7c0c0e093f9ff/29016803551.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/gineji.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/740f141778cdd7175400f702303d5e26/41489157251.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4b66f9df646d56db5cf5e4a0e2ecd98/71831128450.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/db88r8kgro6fr7uka21uenhsr5/19191730482.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607852f1e319f---20961544310.pdf
    • http://coinproject.com/userfiles/image/file/56331607259.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b8e22270---11862690415.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e9487a9e500225360b81a775008b74e8/47576242220.pdf
    • http://www.vikingmaterials.com/img/78674546677.pdf
    • http://ibb-online.ru/f/file/31277151956.pdf
    • https://confidence-ist.com/ckfinder/userfiles/files/polanaludalumo.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/82479207926.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6eae511d24550920a7b887fe7b38efdf/4974015118.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d0d7c4276---80631371736.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a443d3dcbc6---gaminokapokepigunekopanu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=camp+invention+counselor+in+training
    • 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_off0000f204.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 16792 bytes
font_01_sfnt_off00010a16.bin
5bed16ae890bc87fe77685e84fe32b6d581eabccde9c6219f7285936fe020876
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 17628 bytes
font_02_sfnt_off0001387b.bin
46b06ec7f17ede259d5d28e7e819379d3accc514caf20a89e45ce0563c4e8202
pdf-font-stream PDF embedded font (sfnt) at offset 0x1387B 10916 bytes