Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e85a9c6769362a…

MALICIOUS

PDF

139.6 KB Created: 2021-09-01 06:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 03343439e3039e2ff38dfbca14c487da SHA-1: afd82da8f0791e20ee98bb6998b0fadb4f64247b SHA-256: 31e85a9c6769362acf56dac68ebb39bc7b7184f51c5bb0a3292a67496833afcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sikovolexidovugoxezugem.pdf In PDF document text
    • https://hondaotohaiphong.vn/upload/files/43687748105.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/goresakobawigadejejizo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e66265fa7---56314022648.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/fejaxoreso.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de442770d7---19456488803.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/suxazibobodo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55d9560793---29051261751.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/88095192929.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/f3df428309b378e822c31a05dd4dda14/36703567817.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/gukavimawu.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/57854225219.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/kodikigula.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/3cgkj8dls224r8q24rta5ifm41/59836627301.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/29279610113.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/palonifajatusaxufi.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/dobokavoxe.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/82249436951.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-31/20210731101334447130.pdfIn PDF document text
    • https://aokman-drive.com/d/files/97474106263.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/fanasedaxikodenipux.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609e404b3d7a9---folexedajepobida.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/64065272778.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/33884887508.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/32edbad87ac6e58f5d10e3bb587a47ca/17960940980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+hobbit+an+unexpected+journey+quotesPDF 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_off0001bb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB95 19536 bytes
SHA-256: fcfe7f4c18a9bbc416fdd1d1fe6d54cf992f5e1073fbbf1a1f50dd940bd865f7
font_01_sfnt_off0001ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF12 11260 bytes
SHA-256: 5f1d683e60a85e75a38e38ec28012666abe4a83277d6cecbf37e06c0be238684
font_02_sfnt_off00020905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1