Malicious PDF — malware analysis report

Static analysis result for SHA-256 00fdfaa3a8e07d06…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 18:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f0ad12c3da7bed6c845d7669158d6c4 SHA-1: 51bbcba47299dea3727c438458fffc42df7cd110 SHA-256: 00fdfaa3a8e07d06005369aa5a9435e56d461d19ec0b9c49f75e5efef4989279
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various domains, some of which are hosted on compromised CMS upload storage. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/80491101337.pdf In PDF document text
    • https://aghs.in/ckfinder/userfiles/files/zusenijuzedofidetogum.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/mejopukofejarejuxalu.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/zijibiji.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/28312210222.pdfIn PDF document text
    • https://ntc-container.com/upload/files/derapulaxuj.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/33236431956.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/befupamipijipipixoz.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/37e9b78c45c07840c16b12f1b066e3fb/nurilekuzobudenas.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161025bd61c1a5---gozurugigiga.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/93506273804.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/27139096256.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b14d0657a---zibuvagaxitowozivijutof.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/72682166468.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/54061157329.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/d3de619239ed6560b23dcaef79efca22/98895384311.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/bugagokuxofereguni.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/eed492c216d82c310b020dd359eb4297/vemeveti.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c9925fab94d---bekisipad.pdfIn PDF document text
    • http://ctm.it/userfiles/file/rosisetikukunuxi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16116d22fad62b---16354769605.pdfIn PDF document text
    • https://linker.tw/files/8428231240.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/56329980018.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160921543850da---16098867157.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/61121512830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=yayati+kadambari+marathi+pdfPDF 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_off0000ca6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6F 21960 bytes
SHA-256: 2e5778f4a9317dbd44348bfcec3084afd320282eb9ef1c91f25faee23f3ff10f
font_01_sfnt_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 10520 bytes
SHA-256: f0932eb06d11f196fdb287efb99bb2a7e280bb434c253a5b664a4dcd838a8711

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