Malicious PDF — malware analysis report

Static analysis result for SHA-256 921f789110b0fccf…

MALICIOUS

PDF

89.4 KB Created: 2021-06-25 18:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e24409d4b06a1d6481524f31e33b507 SHA-1: 7d1254fba2f54102614d99f8982162be9c839a5c SHA-256: 921f789110b0fccfa05ee2dda9a93d31e498571335c3b359734293c1d8e1a02b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads on various domains. While no scripts were explicitly extracted, the nature of the PDF and the presence of embedded URLs suggest it is designed to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c083d3daaf---58149592093.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c931c8931---logupivupaparesapewonib.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb0d305f7---jimadijazo.pdf
    • http://skolicka.eu/foto/images/file/44441139463.pdf
    • http://cokhixnktientien.com/Images_upload/files/30842161580.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/4vlrjdk37obi5j97j1iu8j4rb0/60331285390.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e375a548fd---gosinoj.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072825d6a1bf---31289380692.pdf
    • https://actor-conseil.com/files/file/6568956628.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb00f99a899a1c805b7797af853472ac/26340341359.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c9859314---84954891129.pdf
    • http://studiofapas.it/userfiles/files/52224711633.pdf
    • http://shqinze.net/admin/upimg/file///81646041114.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2341ee643---pafiwuf.pdf
    • http://bagiez.com/userfiles/file/94441500288.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff0417b7dc92f9c2df3f727bf48041a5/denetidipabisi.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/75111794594.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/rpsk0ihss9jpejsqm6bue368v3/87686713737.pdf
    • http://suachuaspa.com/upload/images-content/files/bapetejidumopek.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/98733649069.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608edc8c5e401---7505227922.pdf
    • https://ferado.vn/userfiles/file/tiderozetuliwezep.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ia0sn5fsft5fn0g6hiihuonqt8/10759615424.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/facf6b7b1b73f579298b19058a9d9c1b/gexapob.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/kf577dbf4qaln5lt3m8lco5mj2/75798385335.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=house+sparrow+red+breast
    • 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_off0000fc37.bin
5577fa4ab3ba69ca3a6fa1cdd37a4861179f4f99dd73c334a78bd55e101070c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 17108 bytes
font_01_sfnt_off000128b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128B4 16792 bytes
font_02_sfnt_off000140cb.bin
377cf870b99f2b876c77a0ac5fcfa170136283d98256d5925942d8c6a62245b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x140CB 10460 bytes