Malicious PDF — malware analysis report

Static analysis result for SHA-256 0683f8138155d450…

MALICIOUS

PDF

130.9 KB Created: 2021-08-10 04:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38896b4ad43efcc34e81ff59d74035c9 SHA-1: 89f70e8e9a573ebdfe962636ff5b47e3db08442b SHA-256: 0683f8138155d450559faea177d8c7dfbe246d39d5dc2b779b9fb12f8e74da1d
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. These links likely lead to further malicious content or phishing pages, a common tactic for distributing malware or stealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6fd21eb8a---kuzot.pdf In PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/76399331416.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091bb940b7cc---dosimusixaporusukozuwelu.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210514083038_1484764960.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/33471774652.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608112a1d7a8c---ligodewepovisiled.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3c6b95671124b826f80fe89de345b1f4/fexarisad.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/bazusosabufefidubunimo.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/nefokisomu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082b60a63680---75162071545.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b69be75249---kaguvijaj.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a5ab4a78b---malomametumif.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/68657163303.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/vovubija.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/86616440943.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/sidoponivekenorozagomaxuf.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/48714280916.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bf62a79aa---katawetomojizexipanur.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/hr1l5lgvis1ujo6ckhmrt2gnnp/nuwibukujeluvaf.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e84ff54186---juxanarapuf.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/d4330e3a85cbbd680ee0b9135456757e/mujuwetikexen.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/8bd8fcef47e482ea6e30ea46cf39fe6a/64712685488.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c5bf9886a0929c90943bf0a824359182/89589861023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=apex+legends+season+6+size+pcPDF 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_off00019a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A81 19024 bytes
SHA-256: ff03035a410afb0a443420c4615fdb313c659e8ef27fe4df02bc39e9f0172b09
font_01_sfnt_off0001cc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC26 10800 bytes
SHA-256: baedfd6e3b6ae273e2895cc6750fb5715f2c38b4c9fe49fb742eda52a64c000f
font_02_sfnt_off0001e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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