Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efb08e2ad237a86…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 02:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f0ee3b7ff579352b2a698b70b51ba82 SHA-1: 59c3fe11c81ce290eb6748ae039c324057582ebb SHA-256: 1efb08e2ad237a86f87ffed5c3f64357301c13469df1164013e2c3ac49a7b98d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and numerous external links are characteristic of a lure document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=parris+jeyaraj+isaimini PDF link annotation
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/faguponegepol.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/pibebevasozufepul.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/poxigovome.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090801535752.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vpm30uanj5omkigg52i4ffokg2/26784859800.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310910d4ac1---mubetewopekumezamib.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/48717862181.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091109532273499.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138940d46f21---nikofegobiwemugosebob.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/rodikedimew.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132363cebf2f---buzupuwenopebotelatiporig.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/58840239845.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/42512734784.pdfIn PDF document text
    • http://santehnika34.ru/images/file/765322329.pdfIn PDF document text
    • https://rjpexport.com/files/71974684276.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/pojaz.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356efd61d6a---79027935509.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/74779731665.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/vipode.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/63865694824.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16136e1e9c0dda---83855590639.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/juxoxaboluvux.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/tonogewetuxezag.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_off0000d935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 10252 bytes
SHA-256: f82dbc6fe7641345fd22cabfd772795540ed9c6232cd0ab5119dd122e72fbb7b
font_01_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 18536 bytes
SHA-256: c0e3353392f544285ddf5f2ca551647d93776df957db18fcf08687b38e78cef5