Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9affbe58f5bbfc0…

MALICIOUS

PDF

89.5 KB Created: 2021-08-10 03:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 003fdb242ca8474c9075def99436361d SHA-1: a3bb3f8992c68342d0b74f34d96af748569bb456 SHA-256: b9affbe58f5bbfc0bdc9ae6f06b2947dc7c215234463ef4ccb583c206e7441ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or payload delivery, contributing to the overall attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=what+are+some+career+goals+and+objectives+of+early+childhood+education
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae1d91255---fazusaxejatevepamaji.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/62he0i0grbj6cm9fbekh5au3b0/17423817149.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/df395170daf3e6271bc61981f1d53e37/1322951368.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/7c04a462u3mkfk9vv00a4kot87/zozukijupenaxibiveti.pdf
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/vawipaju.pdf
    • http://homelife-superstars.com/image/files/77952715645.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b949a3a699a---jevunigelotuwejutetej.pdf
    • http://allaboutdowney.com/userimages/pitegilosiz.pdf
    • http://consulcongress.it/uploads/assets/file/suzibilevumerurasiz.pdf
    • http://cableesmaltado.com/d/files/21645027513.pdf
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/94113644524.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b159b692958---pazajepasekafamago.pdf
    • http://primaneighbors.com/userimages/81021222841.pdf
    • https://nucamsa.es/userfiles/files/10015097804.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f710a35a---degezibede.pdf
    • https://wecareu.net/ckfinder/userfiles/files/jaripureta.pdf
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/17699792879.pdf
    • http://langfordfinancialservices.com/userfiles/files/fuxij.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/6399670914.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7dee85f5e---xakubipopisire.pdf
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/43662419645.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e74b725f8d---21090724597.pdf
    • 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_off0000f50f.bin
1d8c219f649ff2a05bc84ca5dec373b7fb55fcb52c407c1518e24161acea1500
pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 17264 bytes
font_01_sfnt_off00012223.bin
2defe6be3045d8f0a11a0259a68bc46d497b1d818990e47c2131072bc2bac293
pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 11464 bytes
font_02_sfnt_off00013cde.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDE 16792 bytes