Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad84621a4c425793…

MALICIOUS

PDF

94.8 KB Created: 2021-08-01 05:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a1c2a8d2a0f080805fbde3ecc07e11c8 SHA-1: 0f66dc8cde08062ec5c2bca3c54aa4d8d99b938c SHA-256: ad84621a4c4257934d2e813ffd78f39817049b48d0449755cdf7773aed773fe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or deceptive content, leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://west-holding.com/userfiles/file/81100884195.pdf In PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/d6fbb5a97a018597624b9e17f7cfafb0/78192017318.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/nagobosugin.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5280c693ac045b5bf811a45a4491b7a3/47043774940.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca40d12346---mabizezadufusovi.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/gopexif.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/52311502730.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2cd26f299---75909089723.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b23064eaf---xovafepi.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/21700275432.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/wewavif.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/fudewa.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/40467220346.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/07ab44443fea5374aeadca2886580090/53943398804.pdfIn PDF document text
    • http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/93499685751.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4126126af---46488567354.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/8515888638.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/weditagizabojiruke.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/nasitenugi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9a3103740---77833821448.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/32319711904.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/ladadoda.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160e76e3eb9822---pifexalaxovebawurebero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+write+a+short+memoir+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_off0001111a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111A 16888 bytes
SHA-256: 2e5f73a9330af4dcbc0e7325456106c8778261f3309f1ffe59988abc9822fa11
font_01_sfnt_off00013cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCE 10592 bytes
SHA-256: 3e9ac227e2001bdf661e57a91088e0d09bc7769805eb4efeefe24bc13dbb52e7
font_02_sfnt_off0001550d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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