Malicious PDF — malware analysis report

Static analysis result for SHA-256 f277c4077c4158f2…

MALICIOUS

PDF

103.7 KB Created: 2021-09-08 22:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 410dced29922c7dbf18bad73dfe8cc93 SHA-1: 9ac0534015e55d62c1cb0e090597a03f1e0b6952 SHA-256: f277c4077c4158f2291a8454f582848fa86ad38efc4247b3f76370b9c4db9cce
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The primary goal appears to be redirecting users to external sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://www.pattyn360.com/upload/forum/files/towakeku.pdf In PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/duzixupabuvadutatavazekod.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/lojukomuloravisapagizes.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/tajasitevomom.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/vosepaberofofaj.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/kimanuwufav.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/zidesasubudu.pdfIn PDF document text
    • http://cpils.com/userfiles/file/9902308514.pdfIn PDF document text
    • https://zzhqhi.com/d/files/32178759780.pdfIn PDF document text
    • http://kccmaul.com/files/files/figigowu.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/finiteduligafa.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350c3023560.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/97340061419.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340e7f8a85c---gejaviwewibilalagevuteto.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/74539435577.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/19162870095.pdfIn PDF document text
    • https://zzhqhi.com/d/files/94072106921.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/bijimow.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ecce42c8e---buxekofasarosu.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/wovimuvux.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/82623312647.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/pekamafonetawatamazade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cyberpunk+2077+rpg+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012ece.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12ECE 17516 bytes
SHA-256: 73ef8fdd9f276350b593ac78fa5dc7b22af1b53e97601c0e8221c31928cb62fd
font_00_sfnt_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 10756 bytes
SHA-256: 1b6c422323d594caf49901922a9a87dd0e3a20f5b930c8a1db22544b0fdf414d
font_02_sfnt_off00014971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14971 18244 bytes
SHA-256: bfef8c61d1eae354599afc14827d9128a34010afe9b185e88340296f7a15c1cc
font_03_sfnt_off000178c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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