Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6f2d4c3aecc68f…

MALICIOUS

PDF

68.9 KB Created: 2021-04-28 10:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cebe44119ebb281280e239ddee0cc594 SHA-1: 24c05f352baecdf376fd4800eb59cb07a2f49a98 SHA-256: 1c6f2d4c3aecc68fc55f1179c6794a29b0d1bc5ceb7b51493774e84aaf4b9087
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier strongly suggests malicious intent, and the presence of multiple links on disposable hosting further supports this. No scripts were extracted, but the structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607629dba813c---15633411085.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811d663caa0---koseludowaze.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/0633bc814277302b184c8a9ffbbca96c/letabalofazidof.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca84cde276---14862857796.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/5hctl6kbghqjjdqumam2lu8jj0/pubupidemekusatubewanun.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/333a218f57d60e9e0877fa5334b6bd72/49078251405.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/db1e1f102ab31d6ea30911bd6ddbeca2/97067030565.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3c879d18253eda96ac4f10e9b50505be/wozidekadovumofokat.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086076425fb6---gumag.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b8f14264097260bf943991565134ab6d/53177139509.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858f74e8626---juganewun.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608857b63483a---43423128592.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16076500394efd---voboxoberumozi.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95cf05f55---81910524429.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/8bf79426d0knmjmqao1gasngqr/26139339133.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=adding+and+subtracting+rational+expressions+quiz+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d006.bin
e2b459a8e522bb44aa7a5ff7df622edf5e6ba9795eb20b24b3d1fa10a16918c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 5696 bytes
font_01_sfnt_off0000e37f.bin
96cd497094b7bc08786b35a233407f07aabeec2cf2d67e36e53dcf29f8cf6360		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 10224 bytes

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