Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59a9b7071183ba2…

MALICIOUS

PDF

87.3 KB Created: 2021-09-02 13:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96bb33c28804d5d4971939b0d19276cb SHA-1: 1b42b634f1c0fa674267c3941e604fcc6be2ba6e SHA-256: b59a9b7071183ba23670f2aa0a12f7c938fc687bd477d3b8d38d09143621f55c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm with numerous URLs, several of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The file's structure and heuristic firings strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

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://lab4050.com/upload/editor/file/68122937404.pdf In PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/17168417590.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/66621054511.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/nolizufanokabof.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/25e0e3ca2830f2f3c18604ac51f1b48e/4035311085.pdfIn PDF document text
    • http://wjcopy.com/upload/files/vevamajizagejexabezezuv.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/24986838858.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e790bf84868e452c49d72c60058be26a/32958846977.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160757a4f9dfba---vodeguv.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e4309c7fd---8606789855.pdfIn PDF document text
    • https://luminex.pl/upload/file/13656843628.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/gelogeniwunefetowoj.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/58701404516.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/mupujudosetomafebaropije.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b628d110e93---19405867435.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/masupepabamiwuwuxev.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/89203717214.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e686e069bf---10004853768.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c419ae65d6981da11139d4d2969c4d14/sularobokafigopo.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/majuluxiwenilasereka.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/dfdc0e3bb81593de95598d90aefd2afa/79248599610.pdfIn PDF document text
    • http://nature-revive.org/files/file/95643766500.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/54155618682.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609128bcc55c5---rigalubiwaruzurow.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/aad00f3d28f0bfffecc7269a5c24bf75/10230045876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ksi%C4%85%C5%BCki+po+angielsku+dla+pocz%C4%85tkuj%C4%85cych+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_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 11632 bytes
SHA-256: 1ac025d1024b9b514b7c0a3c9199eff820ffb2c641cd6d233430a32124a74a42
font_01_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 19068 bytes
SHA-256: d1e3a53b7bcdc1869b0079da13a3238f7d0f73222f23950fc64483f23e4b9210
font_02_sfnt_off0001352a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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