Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c566d2f9e553798…

MALICIOUS

PDF

78.4 KB Created: 2021-09-12 03:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 583749563300cd51c23d8f3547d83032 SHA-1: 8b528ef6b90492f2a620664f645338f849e90be5 SHA-256: 4c566d2f9e5537989237e6bc2ca364fba4e3764929435481f173d66cc75492d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple links pointing to compromised CMS uploads and disposable hosting, combined with a 'download button' lure, suggests a phishing or malware distribution scheme. The document likely aims to trick users into downloading a secondary payload by leveraging deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=viber+free+download+for+macbook+air PDF link annotation
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/df0cd4157c5731abfb1e15fff69eb7d5/84153195767.pdfIn PDF document text
    • http://baoveantam.org/upload/files/71199999855.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/5217934107.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/78852589640.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/17615898064.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1b7aaa98ae9edbf401acc6c9ac02af57/gonitotewofani.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161376dc53638a---22807443981.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090212333573499.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0703089494a0ef110ab9c28a47649838/50257146386.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/40577313151.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/85329976304.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/87771183726.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/vefafufekawuguwakekises.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/zixelozaxabikumi.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/53409332768.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630594252_1.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/gigijagiseb.pdfIn PDF document text
    • http://darec.sk/files/files/satozuvima.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/kamabanetaxutix.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3842d62de---33164066455.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/57024364671.pdfIn PDF document text
    • https://parfumzone.ro/files/file/96861651667.pdfIn PDF document text
    • https://agermag.ro/mm/file/33955616554.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/doxukaxubuja.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_off0000cc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 10656 bytes
SHA-256: baee8ddc1865568b5888362c16727d679624cb7a8ec5c736732f7951d68c5ea8
font_01_sfnt_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 18280 bytes
SHA-256: d25c04d784e6d5f3a34952beedab50e7017d830f97aac33cfd374c325de3cd84
font_02_sfnt_off000113f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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