Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3c7fe8e453d1ad…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 18:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24a0546d22ea97bdd0346601eb8a2b42 SHA-1: fa5b13a858e8605fb94f58f0a143320c7ffa4d7e SHA-256: 4b3c7fe8e453d1adee5c9a4a6d36a7574e441ef8e950cb4610e8d879813aa06d
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution, disguised as a download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=gals+panic+arcade+game+download+for+android PDF link annotation
    • http://sk-uralstroy.ru/uploads/files/60166763144.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/sedab.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/pitaj.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/73510297056.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/jejomobetowijufuwi.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/3043169800.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/55058058136.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/miposevuvupade.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/925cdcbd71b67e09b4c2b95593c07753/82961399070.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161323a8fabf5d---kivanibet.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b056fd21c4---nakupud.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/47178472606.pdfIn PDF document text
    • https://fratellifurloni.it/file/12580910215.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161384152b7997---62555555896.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337658b4932---bekivutotum.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/7488632324.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/lukoneremo.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/batijewerokogizi.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/90778622189.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hhikpf3uvsnu80pmni6mit54lb/59752376240.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/66133750541.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355ea84765b---81833183518.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/49174341931.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210917_085728.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143da0174a4b---sanutebanaxavulefijikuf.pdfIn PDF document text
    • https://store.steampowered.com/app/1154720/REGALS_PIn 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_off0000ccf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE507 10992 bytes
SHA-256: e37f2bca0e7346b4974d51b45fae337599369e99d7820f2290658bada38bf390
font_02_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 19200 bytes
SHA-256: 3262fc4456be12f445d4701184d258667e372956da30aeac123631c32750c36a