Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82aaae7019625c5…

MALICIOUS

PDF

87.1 KB Created: 2021-07-21 23:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c96b8a90ca76a8df57648bd97c12d19e SHA-1: b787af3f4be867fb71bc882c379435c5c8db8acd SHA-256: a82aaae7019625c5925d968b1593ef6002097433fb0e1d810c5ba1886c8da560
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the presence of numerous URLs pointing to PDF files on compromised CMS uploads indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/28573228f5c934c65515a637c6206f24/katimalo.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5c1b0745d7d4746cc6b28023e8241690/95206989113.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e3656271---64625347573.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lezulozisagotiwenaj.pdf
    • https://ka-base.no/images_content/file/nadififojigezifefovuxewo.pdf
    • https://noticky.net/akce/fotky/file/zifodefebap.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/dm74eeum5ludgbb7tvst5ojp45/34591906314.pdf
    • http://luisacortesearchitetto.it/userfiles/files/36426573306.pdf
    • http://autosoftware.company/autoresponders_images/files/64114867135.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc490d2f7fd---gagade.pdf
    • http://agataklimowska.pl/userfiles/file/xulorafodevolibirobo.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/545213168a8c2881df853cddc6e4f67d/jotisik.pdf
    • http://nanoscopy.ru/uploads/files/51081922763.pdf
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/sorikipudisevififu.pdf
    • http://aarogyamedico.com/userfiles/file/40190357614.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/62a8f9a75ab1d15c99e9d7d92d135de6/54940867807.pdf
    • https://viettincapital.vn/upload/files/giruxiwu.pdf
    • https://www.khaosanpools.org/ckfinder/userfiles/files/79358639144.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd284b0328---ravidip.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609adbba0b101---sakumalavivapititibado.pdf
    • http://bogelaipigeon.com/upload/file/zumalobow.pdf
    • http://kursadowicz.pl/Upload/file/95309824588.pdf
    • http://richmediahouse.com/admin/uploads/file/87087707256.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/8b30df13226eee734eb9e56f4b7ff03d/jajokimolebonolajizowados.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0aa91224525a0bba6ce659ae0003340f/xisamalega.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f0a0547a5---45796538232.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/df69b1fc4ba52916dcd7803dcac8b083/11904791254.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=convert+autocad+2018+to+2007+online+free
    • 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_off0000eede.bin
38246fec434093ffac92cf01653b8acdc7aae3e91d042cce95eedf2791ca5ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 11048 bytes
font_01_sfnt_off000108e4.bin
d8c8bf003503022d88207ac9a594c6763e1552036addd9903d2fe80e90c55371
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 17640 bytes
font_02_sfnt_off000135e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135E9 16792 bytes