Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1a3bef92699613…

MALICIOUS

PDF

92.9 KB Created: 2021-07-07 11:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 448431c8b0a59a4215c8eb6345f40cf2 SHA-1: 4a25b37545b06343d9c4862fb36b2a1d8fe2af30 SHA-256: 0c1a3bef92699613e477a65dc5c487c2479a5f0aed4e022e1b6cef3cda94d3e9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is unreadable, but the heuristics and URL analysis confirm a phishing or redirection attack pattern.

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://pjkconstruction.ca/images/file/rulutofiwaj.pdf In PDF document text
    • https://tvsporedi.si/vsebina/dolonajivumi.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/85352677781.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d1d90e06104185033dcad7402c1701ea/rumowefekeboxajo.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/80709387283.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/waboremasowononojugu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52057b7037---wedugugakutorewukenajude.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/o0ba3fa4iqkn5ttpu8hpa5gcoc/91799994623.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/fafimatipafuwurusapivofu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8f2cb751e---21830026754.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1350225e06f5aa7b4dcf3c82322a2589/fukugure.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e24738466---39169458053.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/sixagiwiradolotedusuj.pdfIn PDF document text
    • http://allycatering.com/userfiles/jakelagirebituzemebewe.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160805dcb29fa5---patojoxesipuwogazaliw.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/maxudusekewuvijuno.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8aa5f7788dc669d8d902f2429dd03f86/wumixirajabojopi.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/87716123343.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160833ac41b405---tidifutokop.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/rilej.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/80598382940.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff52e2d879---fudagubotudituzatoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=starch+digesting+enzyme+in+salivaPDF link annotation
    • 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_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 11012 bytes
SHA-256: 6987762e1c7fb8ef92fff2bcb5a210bfcfeb5c159d907efb052f078901b01e0f
font_02_sfnt_off000137cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CC 17760 bytes
SHA-256: d39eb8be910533dd8e201323edd81ee7932e8ba8e866ccfb46a540525b1f70cf

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