Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05d3121723e9efd…

MALICIOUS

PDF

72.6 KB Created: 2021-09-20 11:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 846190c09747af78c61683f3df51af4a SHA-1: 440370645593f4e7b807c39736b1965b5dd7ffeb SHA-256: f05d3121723e9efd0ba424e8ebe5fe61028ab602e8b936d3427a4208bbeab2d5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The 'ML_NYX_PDF_MALICIOUS' heuristic and ClamAV detection strongly indicate malicious intent. The presence of a 'link farm' pattern suggests the document is designed to redirect users to potentially harmful content, such as phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=among+us+download+for+pc+without+emulator PDF link annotation
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/9ce33d54fb9c1c52162c39cc343a9355/rexapimolujabiza.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/dutinojerose.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/jadibulij.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141284a405b2---nekodusejezeresuro.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/58626975449.pdfIn PDF document text
    • http://marcuspietrek.de/MARCUS/files/file/kilidurokenum.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210905223657.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109102205489278.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/67062463933.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/5634883578.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/qeskgq9742lmukmhvlgsakh0mc/gaxadeju.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/33616138090.pdfIn PDF document text
    • https://andana.us/files/files/mesenulonujeso.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/16384984899.pdfIn PDF document text
    • https://manenshop.com/upload/files/70525308177.pdfIn PDF document text
    • https://eguiders.com/uploads/93959274468.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee922c4576---miberepi.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/kajowixorimezanibu.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/91806350160.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/1620111591.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/gidekodo.pdfIn PDF document text
    • http://tfforming.ru/d/files/79958429333.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/61516285450.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/4259033596137d91d6c119.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/jafewoderelitaw.pdfIn PDF document text
    • http://packturf.fr/files/wanotunexuxukukezew.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_off0000babe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D5 11232 bytes
SHA-256: 604a5ffaa04603bec5695353e5322537bb0415977a88f9d753520e55760457fd
font_02_sfnt_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 15676 bytes
SHA-256: cce39274ff63dcd6a0439c79f11e9405c2426e77cd63b09163e44c336f334010