Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77f571595a494ab…

MALICIOUS

PDF

80.2 KB Created: 2021-07-01 21:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aeab7a57f9e6e718db8382bd0fa730ad SHA-1: e16fea6a966e1391fca8e643f7913f6c6bfa45eb SHA-256: d77f571595a494ab8d3304ede51d69cd91bb0003f289ec956567ffc02dcd6dcd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The ClamAV detection indicates it is a phishing trojan, suggesting the links are intended to lead users to malicious sites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://effektfilm.de/files/file/70482452957.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/phqcfdkct9e3g1bna66ta2aou5/bopeganezezaper.pdf
    • http://thunderstar.cn/userfiles/file/20210523184547400856687.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608642292dc18---fuzomixarizonivivivap.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13400172488.pdf
    • http://4998horo.gmmwireless.com/contents/files/vizojozifinexe.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607792bf4f646---21627333773.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941f031b841---63499859799.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a43dc491a4a---33291511995.pdf
    • https://infotechb2blite.com/bot/ckfinder/uf/files/21077899851.pdf
    • https://meccanicagambirasio.it/file/sevufiji.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608371a027ad9---kivatikekawurenuvuk.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/595b7744b2a3ff3b694ed15f90a234e0/62721712554.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b932b743---75612793085.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/df0f746d5c241a6d378393dc81d1c78f/lokusitixomabafajepekusab.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/17b0ee8188b31004855c99cc77a67de7/29144781865.pdf
    • http://furniture83.com/upload/files/zubamobesigiwomawego.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a29ddc72361---sapenas.pdf
    • http://sys-svinding.dk/userfiles/file/45888648314.pdf
    • https://zlato-eu.cz/upload/files/dixurupazuvabozuvowupok.pdf
    • https://alajuusa.ee/media/contents/file/zojagosawaximerivapobaweb.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7005b5bf9---67044467789.pdf
    • https://hurtowniaroza.pl/upload/files/39484401019.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05030cbf5d---28485504682.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+quintessential+quintuplets+season+2+episode+1+english+sub
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ec.bin
865628d364c7bc73ce5794b85b620963a82d8d4fbfe496506ea46adfdf1e4c62
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EC 11092 bytes
font_01_sfnt_off0000ef14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 16792 bytes
font_02_sfnt_off00010726.bin
7b9d573e9929cc53bab1a21fe088655d90eb32b65f8896f28c37a96fe477cbe5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 16772 bytes