Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e128b38c83ab85…

MALICIOUS

PDF

80.3 KB Created: 2021-06-29 14:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d30fae1eeb6206b701da61d1aef2c43f SHA-1: 1504b111e4c0585767751c669e878054150d7408 SHA-256: 61e128b38c83ab859d77b92f2c42f26a08d7039bb56cf3577ff93ad4ab941c57
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a password-protected archive lure. Multiple external URIs are present, some pointing to compromised CMS upload storage, suggesting a distribution mechanism for a secondary payload. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly indicates the intent to trick users into handling a password-protected file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://irlanc.ru/uplcv?utm_term=php+password+encryption+and+decryption PDF link annotation
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca6fe9d4cd---netulisixupipusetusok.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/36774972253.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b02b3f081---89732120583.pdfIn PDF document text
    • http://planbmedia.hufiles/vowekolow.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0bda6a9ea---53792618723.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ac63e7ba8---majaxukuzob.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/cff9e0956616b50e7179c800746bde63/10307198411.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15529d160d---68796879442.pdfIn PDF document text
    • http://texmet.pl/userimages/file/86295539838.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/4l9r1dr89cqqo84ij1gcptj1fr/vodufemevalupifivut.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ojk85rqcnios5cln3vvdpr3d7a/wusutupuvolilas.pdfIn PDF document text
    • http://dejede.com/userfiles/file/fowalonoju.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c003b468b---84258177823.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f0f91055d---37372387192.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/kewolilezubipot.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/20990557672.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1620957912216.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e1a96dc704fca6da65b7bedbf48a8f53/25553077320.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/sibukifola.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/98419459651.pdfIn PDF document text
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/64530488748.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/5566813346.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a207c1773---84840418499.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/238064e4318539e1d86a2f7e9150b7b6/kigonakojugob.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/xudiratas.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfceb04dad0---38804349537.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_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 10764 bytes
SHA-256: 2a017d229735f3e5c998c28ec6bdf79a20b9ce8e2c83070d770b1fde5b0419d4
font_01_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 17560 bytes
SHA-256: 6a8cf6a7112523be23f24e5b0898b9df0e9250be2ef5fd3cee83172da5d0f4d2
font_02_sfnt_off000119f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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