Malicious PDF — malware analysis report

Static analysis result for SHA-256 d745c616bc980490…

MALICIOUS

PDF

181.9 KB Created: 2021-06-19 07:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ccc593aeffaee9db98ebfbb01238188b SHA-1: f46e9b76e2edcd18b2eb394ec5d0441aba3c2f3b SHA-256: d745c616bc9804909ce5b95c1c538b744e565d2801f5f4865bb1651be14e359c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous links to compromised websites and disposable hosting, disguised as a document download. The embedded URLs and link farm heuristics suggest the primary goal is to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=garuda+puranam+pdf+telugu+download PDF link annotation
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d01c8e47ba---3417844309.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ed8c6ef21---tajajesadufeva.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/46455456170.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9617e8d38a3b2c5dbd029a1c44731113/38979037478.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a07e923ad3f810b381c3e3b1cdc4aa39/natoxusametarejivimobe.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/pvgdsql87og5mlitc8olcua98r/18319498852.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/71924358952.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/85f430fa8ac84358996273a236c042a1/98463352563.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ug3erm3a8q6mcfdn11h2c3t7p5/20779073054.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210617163558.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/54025793182.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/217f359f94a060886af15482da7aa86d/werikijowinowijufe.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/mh83cf3lasb46pluff2bksc1lo/30827708377.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/jesajetexudadejuniva.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/toldbfhr52cjksql0scvl471j2/razakanipe.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00028841.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x28841 22200 bytes
SHA-256: 8bd8564377fd72be61c53f588262f02ac808a89947c38906bb99b65b17525add
font_00_sfnt_off00024080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24080 5304 bytes
SHA-256: 6c89049283282670fe1689a1b4f3137a0efcd568216e4d670b399d0dac412074
font_01_sfnt_off00025287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25287 3772 bytes
SHA-256: e2c7bb3c6d2fbc6b9680c858ce58af9e5cd0e4fbc18f33bdd2ad1d5654d08a87
font_02_sfnt_off00025e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E2B 14112 bytes
SHA-256: 7d0575f00aa9f52cd81bf7e81131aad2430998203ebcb64f43a937e84170d27c

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