Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7912f9f7fea4d15…

MALICIOUS

PDF

71.9 KB Created: 2021-10-04 04:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a3145064840d8ac9896543353ae9f91f SHA-1: 7a2bb5cf3c7df660e80831f109ddd5fa2dfc6509 SHA-256: a7912f9f7fea4d15734c5e23636376b89d1d9f788bce53c8fa73bc2057378be6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains a link farm pointing to numerous domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to obscure the final malicious destination. The presence of external URIs and link farms strongly suggests the document's purpose is to redirect users to potentially harmful content.

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 http://kapfenberger-schuetzenverein.at/userfiles/file/vitejinodakojorij.pdf In PDF document text
    • http://swapnakoodu.com/fck_uploads/file/dokuxuzosovowujozofexasiz.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/17937050633.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/81067980939.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/forerozelasusobejikekar.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/33800835197.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/kupidememunad.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/4583310577.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16153a6f7325c8---39448616732.pdfIn PDF document text
    • https://mbbs.hr/files/48958753144.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/7676245659.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/28575404734.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/befibudivadulolaligevas.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/kuzetetagiwidonegewufem.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/46684314828.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613083f64d2ed---duxigugefafedujonon.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/32958132445.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/14470819173.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f360897975---75682968036.pdfIn PDF document text
    • http://espokebar.com/uploads/files/migenovibop.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/dezokuparupegilelexa.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109071447154686.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/bekuxorazixelav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=malonic+ester+synthesis+examplesPDF 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_off0000b2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A4 10848 bytes
SHA-256: a0e8bcf35c6251dcabb8ed9fdfc60c66d8ddb32393f0fcdce488523614bf517b
font_01_sfnt_off0000cb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8A 18132 bytes
SHA-256: 83077a5b2d14d1e900451078198c2340f403c150351ea744b7f60268ddf2adac
font_02_sfnt_off0000fa4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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