Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b65ea6e0c41d68a…

MALICIOUS

PDF

83.8 KB Created: 2021-08-30 09:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f5fe71731c04b4aeb9520d0fb1533bb SHA-1: 9812720c23b38bcfe4d84295303c1e1af12a2608 SHA-256: 9b65ea6e0c41d68aabc9e0e29027b4cc2c4ceb9f204e818a8dd323cdb5590593
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final malicious destination. The PDF structure and embedded links indicate it is likely used as a lure to redirect users to a phishing page or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ambulatorioveterinariovianello.eu/userfiles/files/mamefudinepisukabapi.pdf In PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/numizonurivina.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/sitizilaveg.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/fegodepajebigavazokela.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/82b2c46722f3001c5d7c4a12f1671459/62983785707.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/renabujuwu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/10sdh5mmm2dorrmgurir7k508e/sadazogapufipiveru.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/kqpsf8tkl5utsn7ij14ev4mni4/74030604589.pdfIn PDF document text
    • http://garderoba.sk/images/_file/82853038268.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pafaxapigof.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/2345239905.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/79106238583.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/62be88defb8f1ae95ac4792544fa9443/68913193277.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/fs3dl49fcqr29f324caqtub4bi/xikoxopi.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/11781115148.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/xulojilijum.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/54490992678.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/17498416709.pdfIn PDF document text
    • http://expresskaliski.info/file/45204001960.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/dinapiliwaniw.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/92880180494.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088865eb8ae6---66744235697.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/62808546257.pdfIn PDF document text
    • https://grancom.by/upload/docs/vigiwixuvedoxejofaliku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=1300+in+lbs+to+ft+poundsPDF 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_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 10588 bytes
SHA-256: fbbdfc6269900e16a41e614f4114861b5be13d9fab5a9d9a628fd73a78a6f235
font_02_sfnt_off00010eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAB 18888 bytes
SHA-256: ff64d1a221e0377bddd47e28688f25e874b331ca93c70ef169477e2f46ede78a

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