Malicious PDF — malware analysis report

Static analysis result for SHA-256 1325da444624ebc8…

MALICIOUS

PDF

82.6 KB Created: 2021-07-10 04:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 06788aa349e5ca016ddb992492dedafa SHA-1: 9858e49e3a8561d2cb685874b1ed96ebd768a22d SHA-256: 1325da444624ebc8e677c4de9f7f29f72b55431a0c3bf6fa2462d0e76a32bda0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is intended to lead users to potentially harmful content. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=types+of+lubrication+system+in+diesel+power+plant PDF link annotation
    • http://turagent007.ru/userfiles/file/gefogusejubifapo.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/71e22db762d96da99a2cc6cc587d9368/fulefenunamesuzumozerin.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/0cvsiaaoeqmi49v8d86u303gld/gebiwukefemalaji.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa44f675204---48866520319.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ba72483de668cdf3f321bc41369c36b4/rotibutufirawujujezud.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cffca18ce4---tagesabapezodifa.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/05fe72522a28595a3d90c5f2bbddcd59/difodawozeguguka.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ud77r4qjj2gbnva80e43bv7d7q/tosonixusazapis.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/31218501241.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d221a91422e---zozezarawot.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/19526936157.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/77781212730.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/fbaa75f04e3cafb0e194174e96dd238d/guvegod.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/11366076135.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/pabogakosovivoxoloruzage.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/21046381894.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb31a0bc6---bafakuvaxoda.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1ef995f46---59231182272.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/52e0c3d262085097734778036a12416c/sotatamuzezag.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8cd17ecd8---97901497681.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/mobejirikaloloduporovi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 16768 bytes
SHA-256: 8b6f8d9b6584add9ede567f8607c2cf42e7166c74ca4e932d1cd17d8907da9a3
font_01_sfnt_off00010afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFD 11184 bytes
SHA-256: b3e0452916df2e75b9967c069a5c582b11f1245ab61c73320ec7849386380d9e
font_02_sfnt_off00012503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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