Malicious PDF — malware analysis report

Static analysis result for SHA-256 d156eb7ea24c8406…

MALICIOUS

PDF

93.7 KB Created: 2021-07-31 23:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8a125de2bec804f0b934d45390c3cc91 SHA-1: ed1c1f636803e854d4d783d50b8f61fe8a799849 SHA-256: d156eb7ea24c84069f75d4626cb98a18c37f8659d77f9102367d4f0219e2be67
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious payloads, aligning with a common phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa67fd76de---52908119801.pdf In PDF document text
    • http://autothudo.vn/upload/fck/file/togowumigojak.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a90b5e46d7063768b3fa96e7c4edf590/69105246878.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6dca296878d073fb21337a58bc360752/7484658467.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/19829697418.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/300147263197.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/pazakamojol.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9d2b7caae---53385176541.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b9ac7a8cd5ca5c813b5a39cd8707b537/rixuwuzotewavabogul.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/bdgc403f2dpgbj40oqv4t9redo/julubotunanejeronana.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffee809280---zupipola.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/8532297305.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bba4e834d9a---xutarexuperaxonenuda.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160838d7910db6---weronuvuwimunoponoxezu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c513d15ab5---kulifita.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/jaxenirojibemabogewogi.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/4735ee72b92b7019a33a42c8703bab2f/ruwitodubij.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/vixeke.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/dirurulepamafuwur.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/wujuvileduso.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/fibodetusunosiwokunilowej.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/nosesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=figure+of+speech+exercises+with+answers+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0001091e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 11120 bytes
SHA-256: d828b0fe84a88193d36faf8bd6231a4105a639bef356efebc2a0d216b42de7b3
font_02_sfnt_off000122e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFB 17376 bytes
SHA-256: d1acd43e13fa10ef30e273208df297f3e1cc97a4476664b04eafa2e1bf336dc3

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