Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b61a35ca25ed71…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 05:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d72d5c7f0d56f21ecea47351c9350cc3 SHA-1: 8b3c571251a973e90dd6a3bd12943dfe945e269a SHA-256: 29b61a35ca25ed717845310d8888202bcaf7d7876f25035f7140632f1f86980a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a large number of links pointing to external PDF files, many hosted on domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm for SEO manipulation or malware distribution. The document body is truncated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://globalbando.com/DATA/upload/files/202108120445286251.pdf In PDF document text
    • http://davidhammerstein.org/userfiles/file/58069333683.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/danapowalegapabadukip.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/jowonujilofof.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/96729674566.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/jevidofekasomulubu.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/telefosef.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/95a3cb48597da7e684b9bedc9d4be900/92834309851.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/17913758663.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/9860770456.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611d011661dbe---mozijopokafenevu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078c3353e572---bolozufeduper.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/54843363198.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/54425207510.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/27fccf84859a771c536ca5f95003dab4/fanaxebafoxorevodek.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/mv01csaa5vic2t43gb2heu9g44/69826886955.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/vagawazerakunovegenenaxa.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4ca6b8ec---15829702077.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/39479477649.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/fedulokimu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/dsiq4du4bqketlqt85v4i3ek83/finajigomutijilapijosisi.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/94715003792.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608204eae9840---wuwepap.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c498eae8b98---16325850516.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/wagiwajogufodipalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=physical+features+in+the+piedmont+region+of+georgiaPDF 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_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 11280 bytes
SHA-256: 3b43b86363ae85bcf2d1ec18955a16afc0948f09dd741bd0f1cc59474f61aaad
font_02_sfnt_off00011441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 17128 bytes
SHA-256: bb5b86214a0543aec4a63d3c4cf75ea0fb13324a568252ce605da717bbe0c442

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