Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff23b8af0f3e40c…

MALICIOUS

PDF

88.3 KB Created: 2021-09-04 08:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ffaa0c9fe13f4374be7a51a6da96fea SHA-1: c10dce0fa897577f1a3a32769fb405b1b08184c9 SHA-256: aff23b8af0f3e40c0dee3f51d498ec98b71d8dbe57c5a8ea3778579f7c4d6033
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lead the user to a secondary malicious resource, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://marty-triple-m.ch/inhalt/files/nevafijomibunapep.pdf In PDF document text
    • https://safrano.pl/userfiles/file/85012766999.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/tiwiwirepo.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/06f208366745e87594de54412ab0ad06/27743198519.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///dalej.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22cfdbe78b---resuxi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897f9b344da---63668879181.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/b85843b34232e3b43ee5f598a5943140/mizol.pdfIn PDF document text
    • https://geniodelweb.com/file/42333189131.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/nomiwegu.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nadinesejuteraniv.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/10282509863.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/86839168028.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f58c186727d0d0e7ab3c357c5c4006f0/jegurejuluzigonuzali.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/pekaburowiteta.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607943c93dc7c---puvoba.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/pumuginafijaxokube.pdfIn PDF document text
    • http://weldingplaza.com/files/file/93821172194.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/7653472164.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/sirawudepoxido.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/97134315292.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/nomujelitotulumagijumojo.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/28690530442.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610559f5e309c---39846732892.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcaed86ba8---difijasojupunowusitiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=transgenicos+sin+miedo+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 20096 bytes
SHA-256: 865216a06e67ea0cb51383d5cdc8b3157be6b29a9c3f676c4471567155fa6d1e
font_01_sfnt_off0001219d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B4 10784 bytes
SHA-256: fc6074cb5e0a8e910b9a1f32d36b09e574bbda6e1c009801d5f448e5a68ba979

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