Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a3548ebd0438f0…

MALICIOUS

PDF

77.5 KB Created: 2021-08-27 16:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3dbe64dabc94de94bea7a9f4bd9f41a2 SHA-1: 2feade7166e8ec2fd1d08496a91ab4cf67168e75 SHA-256: a0a3548ebd0438f03af9b6880b13282c9675468d052e966087c41de0cc01cfd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to exploit users through deceptive links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://33mobility.net/uploads/files/putisuvafemosavude.pdf In PDF document text
    • http://alltechsro.cz/files/kuresevipisudobipi.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/zawijinuwesekuvujifisi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4a6dafd36c340ab1202d476b411ca985/44516691078.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac8439c445---53535844111.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b19857c15---pepuratidawigugebis.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///25712037385.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/55605568095.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/fakegiximeveziwe.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/75961999058.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/55444649701.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/05b3c87af694c148bf28a49c332e6262/90238112415.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3892d2598---52046748332.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46906144279.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60313e3e20---75955596914.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3f3030fb2766b76f3a7a8f159ee706cf/11853203027.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b728ebff2---ravujoganudesagawujenadu.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/78527083709.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/93920237061.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210813_3AB81C00518C5C4E.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/613bda2b618ae55e738a970ab2887c60/ruwabawibunufonidev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=st+peter%27s+jacobite+syrian+orthodox+churchPDF 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_off0000c437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC437 19148 bytes
SHA-256: 63e8d359b8de386fc43e2d849b3a172ac6aafb549d3f7cec4a8a6aa2265c8c71
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 11260 bytes
SHA-256: 2c739e04e0a994742ced6e35ab29545c43709daa6e7ca52f73dfd81e75cc2f65
font_02_sfnt_off0001108c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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