Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4794bdf964cdd4f…

MALICIOUS

PDF

89.0 KB Created: 2021-08-09 12:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 92626941eba9f4ac26e5f55e3188cd77 SHA-1: 8113c76a5abc60cbfdd6018bf3e089610a80bad0 SHA-256: f4794bdf964cdd4f9b78039530a236dfe525d7ef04ea7b0a23f7621f524a1300
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to multiple compromised websites hosting other PDF files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of using password-protected archives to bypass gateway scanning, implying the linked PDFs may contain further malicious content or lures. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adfd930419e---losome.pdf In PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/42914188058.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/agapmq411kn8o455ranvno9a5s/luxesuruzubajogej.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/gajuzenobivitas.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/2164415590.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/8c33b979866affbbef40e40b0150b288/86669660697.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc1271cf22---29823020623.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a189059d1---3981472637.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/24395613424.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b33b37f00e2---49904286097.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/2848289673.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a701b163770---bajorepurekexiler.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/c65331236b8f09e3fc500de818c7f005/kurejixopuwabatevi.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/87905336604.pdfIn PDF document text
    • http://htwy.com/upload/file/nutukidoduji.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608120da1ed42---wakerurufe.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/fabimabuno.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9c7c4a7c---39815404791.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/18277588965.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/98249762614.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/pn62mtpd9i5358knujr641dc09/sisuxajazejijeman.pdfIn PDF document text
    • http://01host.ru/userfiles/files/14924370126.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/38505bb582e0e9040d087126314ee1a3/vixazexevadexaxigapezes.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f641866d0c3e1e3a1e8eaa1a0152b696/tisexaxaruzomozenadumok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=need+for+speed+most+wanted+for+mac+free+download+full+versionPDF 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_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 17596 bytes
SHA-256: 2573e708e72189ae9171cb56ec8c3b86db9305069ce07625cec391be94252516
font_01_sfnt_off0001239f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239F 11012 bytes
SHA-256: 3c589f3ded87eb3b8a61a25a74db6f32aeebd0610133eef13a84c3342f8139b5
font_02_sfnt_off00013d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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