Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfdb7dbc981552e…

MALICIOUS

PDF

94.3 KB Created: 2021-06-30 12:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bef5ae7dd38c7d067e37c7a8a09473a3 SHA-1: 67434d8726e67d66d96823585aaa8cacf5110eb7 SHA-256: edfdb7dbc981552ee49fe60ac83047494f53a74042e1763f856a7a0371eff28d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a malicious phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm pointing to compromised WordPress upload directories. The presence of numerous external URIs, including those on disposable hosting, suggests an attempt to obscure the ultimate destination or host malicious content. While no scripts were directly extracted, the overall structure and URL patterns strongly suggest the document is designed to lead users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=different+shakespeare+plays PDF link annotation
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e90b259fa---42216266743.pdfIn PDF document text
    • http://boursemoi.fr/userfiles/file/suliradanufefu.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210628082745.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/94ncdralrr2ap2j6679uu039a5/ziwomudukufisa.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714ce7561ac---43038318903.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/k22t4svdjmkp6ug7nt5urv0re2/50471860843.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b2ab33c4a25d5f0907fc5026c1f50fc5/47851629674.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e23c07306f---89933416207.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/jomojunatakolezidiwum.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/savuvotukolonudej.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f6ca7c45d77ab5632e637d203d833cc6/dujukofifevofaw.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/49q3bqvt563r4kkhnn0snncfjv/3456683711.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff80706c82---66068449989.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/vudiwumo.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/18706561787.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3685b32a73a38fb307e9385b492c5916/98152237188.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/65444602542.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/sewasozisakom.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/66151079389.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/llj9n3j9jctl09nlfa7gq04btl/85312570740.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/6ko6ibi0sh5t191jldtngg2uid/ditugozamo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879c5e14ac1---zovekigawugijixolomufexix.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b29df5f6f0b046e0e3894d07fa5ae07f/bulotevazojesime.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8770eb13a---23939538233.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f81fdb32a---wesisarekuziji.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5dd2a6b15f0581a86a7c1dd9e0144057/46913279727.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_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 10544 bytes
SHA-256: 924dae4d93d459046fc2cb4531fcdf5dcfde14c8df2569105b8c2a26750ccda8
font_01_sfnt_off000124ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBD 17268 bytes
SHA-256: 102b564570b91c089011c669c881c543572b9d79e1568957de3b4cc93a04e810

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