Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0681b1616ca9bb…

MALICIOUS

PDF

96.3 KB Created: 2021-08-02 14:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 571d0cd6b81d04315f860d9af5319753 SHA-1: 5d819aaf1611cf8419429a31fd636db2c9dd648a SHA-256: 5f0681b1616ca9bb4f3dfaa09ff9d104bd10f6c154181e99497d795b6b77a8be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress sites, suggesting it is used to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc5e850e3---90115617988.pdf
    • http://campbellelectronics.com/uploads/45375088251.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/49ca2c0dbe91ea57527f5495b792d7bc/15720264377.pdf
    • https://asiarsolutions.com/userfiles/file/pubujadoseluwitozozubofud.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da19f113f2---renonezewa.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/fm27t56g43rs9v5tu1jlel9dks/dapirukujijiso.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/4904fe38b5fb724f3198fb65ebc29f16/6029008464.pdf
    • http://tuzlakart.com/files/1361746952.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b8879756055b3e6c2288a485ffcac104/matamiparufulasogiran.pdf
    • http://cityclick.it/userfiles/files/dexaruleve.pdf
    • https://coebmsf.com/userfiles/file/tokavamedekonij.pdf
    • https://thinkhigh-tech.com/d/files/xudekipumanep.pdf
    • http://www.kymenhome-etsinta.net/tiedostot/files/woxajasar.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/30fd197c885db8a8ca6c53ac6aa9be21/92748103925.pdf
    • http://esistore.de/userfiles/file/lurofevodejaladofoninibap.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/bbdad56b18e03aba645151464d54a194/76352329588.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a6122a01c---lefegusotumipolabumizofot.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0633bf26e107bedc29b46224454c207d/levafanaxupibal.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8afd86bef797c4e55b1be4850b4f0d40/14563465375.pdf
    • http://sporteambiente.it/ckfinder/userfiles/files/miligoxeji.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bu9m7nheqqbc3nskl18bbv6sr2/kexanuxorifikitufuvi.pdf
    • https://mszukam.pl/dat//file/5286879986.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66caaf042e---xoxuwusodokijumopubejo.pdf
    • https://serwisnawigacji.pl/userfiles/file/91037014100.pdf
    • http://thienlongadv.com/upload/files/13562792439.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=soundarya+lahari+slokas+in+sanskrit+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://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_off00011223.bin
0f54875c77f2745f37aa48256523296df34ca5d42fee0be6e41c4790b9ec01d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 10844 bytes
font_01_sfnt_off00012b16.bin
40e1fdc8661e6e1bef6f83838a288d32f0aa05cc3564915618c74cc2e154e76e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B16 17840 bytes
font_02_sfnt_off00015a19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A19 16792 bytes