Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee817e0af2c4faf0…

MALICIOUS

PDF

108.7 KB Created: 2021-08-31 08:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c8888f315e23a6b69105ee959e3ad39 SHA-1: a44e886cc855ca276546aaa185f0dc25f7365266 SHA-256: ee817e0af2c4faf0897299b83b5eeb67a13d0fcbd4cf968262c4c78f2fb7c40b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are either compromised or disposable, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document's structure and numerous external links are consistent with a tactic to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://asi-filter.pl/files/file/sidirelulafim.pdf In PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/fuzakik.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c552fc24f6e890d24c404ad6697b6957/kefusujolawogonel.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/17559060390.pdfIn PDF document text
    • https://isleo.com/i_photos/file/dukuziganojakijizobejiwub.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/32245596494.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/nijupupixuxefitupefava.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/pusebowawovuxukixezago.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d05067ab255c71c0dfb1e9fb8a8e5081/lidavudapigabexopibi.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/lusevumen.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/sixeb.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/66467039326.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cropnodrsf4m7m0jbbjntfr1g0/lovexe.pdfIn PDF document text
    • https://susta.vn/userfiles/file/51423830783.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160824986c428d---sematego.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/89465788523.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608754eeaefb0---9508498978.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/98719231853.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/88883774507.pdfIn PDF document text
    • https://rjpexport.com/files/figojawakubavir.pdfIn PDF document text
    • https://phr4u.com/files/kurulivepu.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/77415984668.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa24ea33e90---95474724147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=thermocouple+types+chart+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF7 20584 bytes
SHA-256: 5dd0b09e18870cf86c0b2ab529814930950e0bf5d805c3713ecc866bed796256
font_01_sfnt_off000173de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BF5 10868 bytes
SHA-256: e77c3e86a72d77aca7e126bfe9f9d69adba91b459d30f1afbd92a5e879bb29b1

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