Malicious PDF — malware analysis report

Static analysis result for SHA-256 a383e0bf4feab52f…

MALICIOUS

PDF

145.2 KB Created: 2021-07-02 07:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 80a9b74bf2ede7ab1493bb7f6764201f SHA-1: c1e7c74376af6077f6a4c8b9015df37c42ef85da SHA-256: a383e0bf4feab52f8daea739aed915687a7efe3985515fd4437dbc396a7c2ec5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. Although no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to external resources, aligning with phishing or malware distribution tactics.

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://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29e840a634---zafupetubeba.pdf In PDF document text
    • http://bioident.pl/photos_fck/file/54363483843.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d04600ae7f4---dozisifeji.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9660a7a729cfd1a821d02b1fb557de22/17412483191.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d70e45a765c---64371394204.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc41d2a8b2f---39633304831.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7a76909830f48b496358a0087dd20629/pekumabi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e702ee8d3---48831730541.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/jabetoxafo.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/rawedimimajukusi.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/zalibelilawe.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/sidelate.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/0a000d2abea7bf22a626680069237e49/79403629547.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2a5c6e78---jijulasinimoxuwewefo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dde3a90dff5---16560524647.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/4080a46de2c12004baa7485262408ef2/kefabi.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160870dbfb3c4e---79567276097.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/77286200610.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/17721496357.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ai8jfnmp0bj4jhs85rr2roonhe/zigenunuvofanuwigagami.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/88413654088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=dawn+of+the+planet+of+the+apes+trilogyPDF 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_off0001d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1A9 10840 bytes
SHA-256: 5770b517ad515ffef3c540f64cb0bd1cd00865f89debc9e3121a66426abc9da3
font_01_sfnt_off0001eab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAB2 19452 bytes
SHA-256: f3316e118f41e0b20f73d8eb86ad0a119dd616ace95312079d702e435ab0544b
font_02_sfnt_off00021d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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