Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f5ae29438828d9…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 15:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 968673a05f03c4b870b4a7cf24602cb9 SHA-1: a402216d18377be923512c0b3b9dd0d797549f13 SHA-256: a9f5ae29438828d95feb98317387158eee51850257a1a662d104491a2b6ff5b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of these external links and the overall structure indicate a phishing or malware distribution attempt.

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 https://allytemp.ru/uplcv?utm_term=free+drum+machine+for+android PDF link annotation
    • https://vyrukrc.lt/userfiles/file/62103749392.pdfIn PDF document text
    • http://jadeite.ru/images/file/65592730255.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/17551447708.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/27245933074.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/rusikobegox.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161332e148cd17---depelokekafotawelasawev.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/diwulofesifax.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/41851914225.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/84346295227.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/mewiximenorixabaxena.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/30117942049.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b82bcd267b9195f700d7c34ac8665fbb/50129248533.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/94190762178.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/votiferilojedizike.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615032457b6cd---farabafefinorivofo.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/zamifu.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/xobasapagen.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/puzowowomig.pdfIn PDF document text
    • http://onlineauadms.com/ci/userfiles/files/7979885991.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/43746005638.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/lorerilekitapagoma.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/31122341807.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/31165027041.pdfIn PDF document text
    • 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_off0000af73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78A 10504 bytes
SHA-256: 11026613cf4c186ff87954860162371b57d9f2e025e0d8778d4681216efeee31
font_02_sfnt_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 17604 bytes
SHA-256: 3c3ec5027c2ca8896d3b8482484ece5300128507883be496e3a9218d36f41027