Malicious PDF — malware analysis report

Static analysis result for SHA-256 e797c399de2f257c…

MALICIOUS

PDF

90.1 KB Created: 2021-06-27 17:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c001b4b705df1ae917eb656ce9b186c SHA-1: d294a423c2003451818075e755a8bf43970db964 SHA-256: e797c399de2f257cf27aba3c4a00698e9c77ea20d375d4757b0a489634d51158
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and a high number of links per host, suggesting an attempt to manipulate search engine rankings or distribute malicious content. No scripts were extracted, but the structure and link farm nature strongly suggest a malicious intent, likely related to SEO spam or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778da25f2c0---61061913668.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9bd498e1e---70920278539.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d7f77fbf715165965dc03d31fd67e063/43781487140.pdf
    • https://llsindia.in/FCKeditor/file/85352205309.pdf
    • http://zaun-produzent.de/userfiles/file/kobotomololokafagi.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077e3a39d2ea---zabojizam.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/nitel.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/k6vlmsk3fa0n095l06n4db3pfm/11768222419.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a96c3bc60---5657646095.pdf
    • https://pet-fashion.ro/mm/file/nedegebar.pdf
    • http://esoftland.com/userfiles/file/66381434623.pdf
    • https://zoorichi.com/temp/fckeditor/file/fobutukojagazamujowuki.pdf
    • https://blugarden.eu/file/77396520844.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/o5rici4m96t6c5lano8f1i3drs/3946816173.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093b196996fe---53592593511.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/7cdd5167fc340154ba42bd9e279837c6/jevefixox.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f52df015dc93138f3680e16e316d5789/kubagojepixirewesemovub.pdf
    • http://traiteur-ribot.fr/userfiles/file/35682275089.pdf
    • http://naturallabs.fr/userfiles/file/15094887146.pdf
    • http://cnkls.com/userfiles/file/1623311066.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/vrbj6v5uvj8f240svqc558iue6/disafuxokerilu.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160707fa79c649---69449740732.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=example+swot+analysis+for+business
    • 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_off0000fe09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE09 16792 bytes
font_01_sfnt_off00011620.bin
31914a46f9c2c03d50949936b9cb48ff13c51008f42f3a223a9bf699c16c9c26
pdf-font-stream PDF embedded font (sfnt) at offset 0x11620 11044 bytes
font_02_sfnt_off00012faa.bin
ffcfe112bcabceba3980f66a30bb14adbaab129b7f589b3d3e876a478ce2c458
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAA 16856 bytes