Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc6c7cebecf4ed1…

MALICIOUS

PDF

72.1 KB Created: 2021-07-18 11:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c12cd914de876a77172550c720ee7f0 SHA-1: 2e59d836dfe621d3a9d061c7b5f110f1f7629a9f SHA-256: 6bc6c7cebecf4ed1bc2a958b0fbd31710835d7c0e254ac377c22be5895cd064d
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple external URLs, some of which host further malicious PDF files. The presence of numerous links on disposable hosting and compromised CMS uploads suggests an attempt to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/f93c6ff4f5ea4b750156e66378acdcf9/xenegobotilojakupob.pdf
    • https://hoalavender.net/upload/files/rejigulupujonujep.pdf
    • http://kayapaliinsaat.net/file/savedo.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609afd29eb1d6---davudegezugazegalagus.pdf
    • http://studiolauramoschini.it/userfiles/files/nodixuxagesekerixile.pdf
    • http://artospace.com/pics/file/fafuxugibefaxekex.pdf
    • http://cjandjunemillerfarm.com/clients/75830/File/1863760242.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8a08271bf01612829a62b9dc934e040/56441929152.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/914d366784521ece2aed4648d82eb1bd/16073589534.pdf
    • http://www.addvanceo.info/userfiles/files/lewireterosilojumataga.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32cfac086---59456864942.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cec2b8db8f---30170589596.pdf
    • https://bisnismedsos.com/userfiles/file/27346918315.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb777d030de---nizukexirulovadimiluvi.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/5cc58f8c04f3283995963568c5eb6218/digifidodesijaxibo.pdf
    • https://auto-rujo.com/images-editor/file/fireronudisana.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/45b9e6f012a6fbe1bbf1d28cda3e0c81/gagetorozamunewunipada.pdf
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/52440408771.pdf
    • https://sanidom.pl/img/file/titegedulos.pdf
    • https://ddshower.com/ckfinder/userfiles/files/77932894604.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c187863b1b---luzumakowavalivinubuma.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d1aedca06---91461508160.pdf
    • http://madveras.com/ckfinder/userfiles/files/50043623242.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+do+i+change+my+computer+password
    • 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_off0000b74f.bin
398affa3895a95a7dbfd257ffa6923ce193a6aa565588c05d3eb5a7baf26e330
pdf-font-stream PDF embedded font (sfnt) at offset 0xB74F 16252 bytes
font_01_sfnt_off0000e139.bin
7fc0d387bb942b891d4a37570be9f01af526a6cd410b9edcb4f3b2d61dfab28e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 11208 bytes
font_02_sfnt_off0000fb1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 16792 bytes