Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd84f4f7118fbc7…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 03:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8263d7d43ca4fcbc28683dacea9634b2 SHA-1: 6e26a5a59ba4863a9515ca73470c08bb263cb7b5 SHA-256: 2bd84f4f7118fbc7bfd5f7e42128a048cc18d037cf810b3907262ac0123d0240
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics indicate the document functions as a link farm, directing users to multiple external websites hosted on potentially compromised CMS platforms. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d74141454---30882831136.pdf In PDF document text
    • http://we-women.de/default/files/uploads/file/33206038276.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/98862958076.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/xufimolajojezepivetafu.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/69202259769.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62680080301.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/0e740vilvhlbd10np0dq51nnc4/putubepirogadu.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/5528323598.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0ab283c27---gapugasivep.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bed96bdbf9---59304627283.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/7379237044.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/xomazibil.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/zasodazopoxepofogotirapi.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/xeviwadoxevubavazevon.pdfIn PDF document text
    • https://oasis-travel.ro/files/1260173883.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/vonebi.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/tofan.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af998a2c91f---vobitel.pdfIn PDF document text
    • https://flyags.com/editorResources/file///rasazelizudejowafa.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/69414328353.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/temilenonejega.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/831830231.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/63950795787.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/30222368352.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/xupakutuforev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=abacab+tab+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_off0000ca0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 17108 bytes
SHA-256: af8ea2e97f898b2478a2150a7efe78ce88a86d8f4b847aa9f4cac6a3d3c5a4a6
font_02_sfnt_off00010f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F12 9972 bytes
SHA-256: 1a600ee11e1ff077b725e794201490b55d842cd4eaa26cca576a201fdeb8d916