Malicious PDF — malware analysis report

Static analysis result for SHA-256 b400d816a29ea75b…

MALICIOUS

PDF

82.2 KB Created: 2021-06-25 21:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c365cfff5982e6a87b88851419a89212 SHA-1: bb5d3255a3810fa5c92c177904f9bcfe64b1255d SHA-256: b400d816a29ea75b45d3b82af2c84bd05b56f91b75d762cee8e2ae4cd1af3baf
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8eb72dc69---6865453657.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607046d143d15---40501649853.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087709b247e5---82505094568.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a38e90b2cb2cd42cdb4144ddb638bed7/womovawawomidepuvej.pdf
    • https://sbsoftware.ro/admin/userfiles/file/telubobise.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/33b649e6fef940c2337872d882fcab3e/36522471515.pdf
    • http://iaestedresden.de/userfiles/file/26846057677.pdf
    • http://ankamet.com/userfiles/file/52126727467.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824cbe87400---94390435507.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/4n7d5ur695so5ag64qjp0gpg6l/25405971997.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/10adfa93904f6c716b70827e2c3fb02e/5378946801.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086173b117f5---wukurofokig.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f1eb37223---32107215285.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/35900a59ebffe266d941c1f3bcc7797f/85403744632.pdf
    • https://alakharia.com/public_html/userfiles/file/pituz.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-23/20210523124906444020.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/fe19f74db8928f787b17edd3113c26c9/30990139656.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/ab6e4651c72439d80c2de0a44b05c28d/valazatugumev.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/1b2bc232e15f5a31130c00ecdc3a229e/68489223786.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cfeb2ea4e---51914160214.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67551e994d---nuwunebuxu.pdf
    • https://usdcp.jp/user_data/userfiles/files/zixuxelefomurumowoxe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=when+does+an+equation+have+an+infinite+number+of+solutions
    • 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_off0000dca5.bin
305758d2b67a7f15a594ab7572c4ba8cbbd7bc2513c6252976ff317d2cdf8144
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 11064 bytes
font_01_sfnt_off0000f60a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 16792 bytes
font_02_sfnt_off00010e1c.bin
0a3ee127e8eb6edb0efc0b23c76f22cad30f014aee21928cc67c1a7f41b86267
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 17100 bytes