Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e79c82bc630102…

MALICIOUS

PDF

98.8 KB Created: 2021-08-04 04:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d2f88357120e678607aad3aa03043a8e SHA-1: 04c92db231677b6fdc0b304f2d4c8dcefbc807de SHA-256: a2e79c82bc630102cd0054f12d0db9dced584dd4983c8fca33c470f40fbde63a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or exploit kits. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nfc.soo.jp/file/14008327516.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d02e6259dfa---lotasupilesemirimafosu.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/gegufumenuturu.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/ziwip.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/73563441982.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6f196953fa3bee11579d0c9112e7b95b/jazeziredorepek.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f163c48e9---37001698111.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/lgcvbie3ftndsoktl5bk9v4e64/nitarez.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/kuludaludefomowuk.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/88165047329.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/kezalurokajifab.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb53c48cb9---xeguwokita.pdfIn PDF document text
    • http://carszana.com/image/upload/File/82354812816.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/9623917483.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/18877717755.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/05ccbeffdcdd419f9cd62e7bc2e4b273/78657149855.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/42778804136.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923ac1cf6c0---14172109422.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/46151597516.pdfIn PDF document text
    • https://marosme.ro/hirek/file/71639189587.pdfIn PDF document text
    • http://honda-vo.com/upload/file/41274413460.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/jadodutobenoxosolexut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+are+the+types+of+covalent+bondPDF 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_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 18868 bytes
SHA-256: edeb217faecad281c9746e359985aeac97095da3a7f2ea3a5158c6ae02565bb2
font_01_sfnt_off00014adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADF 10936 bytes
SHA-256: e4ceef4dde2af54db2a437e369089b4d822b36cdbe152ff2b0f04c6159918cea
font_02_sfnt_off00016405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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