Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba7167c3ee7fbdd…

MALICIOUS

PDF

86.0 KB Created: 2021-07-13 17:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a26c06f6d8cf572baa36a6a98db4531d SHA-1: 910e33fe360493ddbc4d44a9527ec9e8f6f6e174 SHA-256: fba7167c3ee7fbdd951c582a2643938e249c7e332c583baa26a1834f1f942bf4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The document body is unreadable, but the heuristics and URLs confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64d3348d2e---wegufa.pdf In PDF document text
    • http://ridendo.cz/files/file/87939714395.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/37113190904.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/46897373260.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/padepikubidep.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/85212526642.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/93553284523.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/75422370151.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c584643d4---34428507500.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609faa93f0e72---54976071690.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/kurudeneganukomugobosu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607874f68f4cc---87553118098.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/91453539488.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/84782083796.pdfIn PDF document text
    • https://raljob.com/userfiles/file/lusixekilixedoded.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e42ce5bcd0---22132115691.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/d79e729668b28e323ba05778aac9341b/lelagusalezuka.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8e481475add035da54487ea8d3b32ba3/29621225040.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072a61241212---xigukexureduvakibatona.pdfIn PDF document text
    • http://tcihk.com/userfiles/27326195178.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/14976553458.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ce72e0ae9---tilivog.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763c602fc5f---nagekiravusoxudewazot.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/056f74nns3j4g1j4n8btpbeahr/49824109836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fire+spec+wow+classicPDF link annotation
    • 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_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 10228 bytes
SHA-256: 8b452afe2f910e3b0ca9392305f3b04507003a1efef41982249347a322610f4c
font_02_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 16788 bytes
SHA-256: 7c35dc7040e32233ee3e251b75b26940c3b344eeedee9a72df8a4dd7eb1a46f9