Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d04e85eddea21cb…

MALICIOUS

PDF

100.6 KB Created: 2021-08-15 11:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 83413d55eddd03926a22937c5799a369 SHA-1: 18b4bbedfc417e6844f1d0c47b9b48dc01f7ea9f SHA-256: 4d04e85eddea21cbf7f0a7554f20e4d82e723faf565fe28a1ee34402fd3fc92a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised WordPress sites or disposable hosting, suggest a phishing or malware distribution campaign. The file's structure and embedded links indicate it functions as a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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=tableau+aliments+glucides+lipides+protides+pdf PDF link annotation
    • https://aksukartela.com/images_upload/files/libegivabukusefizozogiruf.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/832661e2a91f9aeb09ec824016950686/30394671795.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/61bf9e1db067abb4cce1c7bd6d674429/57268701656.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/18899572809.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/dc6ca5bad19ff97d016c70c01a72d7bc/dinagokazafum.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610053ccca8f8---28920413402.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c58aa8751---11475809759.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec5f76e7ba---54947899380.pdfIn PDF document text
    • http://cecev.com/stockages/files/lonaxuzipisosi.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/wawebinarokokozubesobo.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/pinifekitovizatavabobel.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160910c2328dbc---2939924857.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec203ad43614fe98857a7cea79172a75/52191305461.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160782fac54fd5---suwabaxi.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/nekubifeguj.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/67f390cdc8d9327a616d7f608696661f/momukaxat.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfb360b565---7570140491.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8abd889c1---xewusafeduvunuxuv.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d286817a91---60397613247.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/54961470151.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/87379152187.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/45331215574.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/davarup.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3129de775f---kukodalemodad.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/58122571358.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_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 19272 bytes
SHA-256: 087627268d93dfa20aa3d9d4eae8a2853b9bc9ece88b67f4c01fdcce3576f6a7
font_01_sfnt_off00015033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001684a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1684A 11168 bytes
SHA-256: 2e5ada142aced430c88d74a66c197b56a4442129d3a55ca8cb1a92736c39e1e8

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