Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1c7b1c471a0cbe…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 11:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1cd7b44620a43354033be69c3e49e31 SHA-1: 9fc0c35b4343eeec0069521f01bc27d02245c8dc SHA-256: 0a1c7b1c471a0cbeb1285587f68b9a7d81db1f58da5bb49371784f7b918fe29b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct clues about its intent beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160716dd5d2e72---39002789286.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8hifjuj5q11ctepmav65kv7co3/17638110115.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/da7bb4f1ec716847769858b3c29470af/27846821487.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c596563fa21---suxanagitos.pdf
    • https://clumba-indoor.ru/files/files/40240990483.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160acf8f1bc61e---3992225128.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b2a00d496---53129533327.pdf
    • https://lentes123.com/aym_image/files/lobeji.pdf
    • http://lederstuhlshop.de/ckfinder/userfiles/files/27912750175.pdf
    • http://historia-bfured.hu/userfiles/file/77648523327.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/46170c1e4cb86a8e4825cad813943cdb/salovurenadimuxerijaveka.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qthhgb4caqr945dpif9gimfr31/juwasokeseneminepul.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d0dcbd8f72fae51e0db054aff419181b/gegipiw.pdf
    • https://wsbtitan.com/images/file/xekazokidevisiro.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/37hvqnc33uc863oq38g1l2p6lq/79214163388.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/82144007167.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/49310182770.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/tavexamabajojaw.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dd99cd438---14814438405.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d8c15191f---7625903117.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf03edc10---34087451956.pdf
    • https://atamergranit.com/userfiles/file/3140665059.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608990c794be5---kefodufamufajo.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/u8ikg837v4uvjur2ca32cqddl5/87508192445.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1fa10b14cc271eb26f6c34c2082efadf/50410892473.pdf
    • https://beautyyaurient.com/editor_upload/file/joguradiziva.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sampson+character+traits+romeo+and+juliet
    • 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_off0000ed2c.bin
e6958a0b7332df28bf65f0f9c26bdaf08c8ac5f355af09684cf5f2fe92ab9bb6
pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 11084 bytes
font_01_sfnt_off000106b5.bin
4f8894169c15c59e5c6a5de7d33e8d60fa9241d34b9324dc5298a0e1ef221bea
pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 16472 bytes
font_02_sfnt_off0001315d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1315D 16792 bytes