Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e506352742b8aac…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 10:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12339e57c202b0ff0e7a8dc4ddafdbf4 SHA-1: 6ec505002d1dd9e1935724e034a4de935c5bb57c SHA-256: 1e506352742b8aac5b09503d7f0b5a2e085aaa3afe0438778682b81c3de26c8a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via the embedded URLs.

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://pistant.ru/uplcv?utm_term=stream+of+consciousness+virginia+woolf+pdf PDF link annotation
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58fae5e374---81602663879.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/rugurusojoniduf.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/8u0nslsdb33khlk735t3pftcf2/lagizalikipigotafal.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/76307434749.pdfIn PDF document text
    • https://attack.lt/images/files/73177463806.pdfIn PDF document text
    • http://chamdure.com/DATA/files/66754879626.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/26331902172.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917b2be458b---40043237632.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/ripoxaraber.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2607d381d---52073582228.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/94fab793ba0e78f09a13d52468b1ba2b/mikomemakezekuwor.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/8488472674.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/gobixesofixetemufa.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16080774e1ae04---sadomu.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/merarosaxararetemuxa.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/xefuzilidukibavixalo.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b728d026b875f9901b5cce0a4e6566a7/zutejolumi.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/0stp9cdnm7vietq2micilkrram/19144860546.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/5ad19dbf3f2ea8b8158718cfd69c37de/repipojorebure.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/16104698816.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/bcln3418vjn04otrv93n9hoqgo/80071012608.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_off0000df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 11288 bytes
SHA-256: 7e0d88d7f13092518cb8f4c8c62e91f1771d5165a302d9f49778c10127ca4ac4
font_01_sfnt_off0000f9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 18912 bytes
SHA-256: 257b245e0d7d0948f938caf2cc854bf2e108e1fcee987be349af3934acc83661
font_02_sfnt_off00012a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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