Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6481815af7f4e55…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 09:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3ea3b5d40ca4c1ca0a63d312dc1d1144 SHA-1: d6119505d46102063570d268c501df77759ea82e SHA-256: a6481815af7f4e55291f9b2a8521b6e16707d8b3286e48f377aeb01789382756
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest it is designed to lure users to phishing sites or download further malicious content, aligning with the characteristics of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=lahoriye+full+movie+hd+download PDF link annotation
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/sobalagisuv.pdfIn PDF document text
    • http://ducnhua.com/upload/files/76532418824.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1d1ce32ddc6de48b1a5b776d1d1f992f/83124510414.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/newik.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/tabopuzatujudetutijavinuv.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161439fde63b14---moxesawafipipitamiso.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/guxexuwojebixemaka.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/53990155681.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/3c5f9cf575af46cc1999b70519154683/nedibonuno.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/mowakazuzuwawalotinuzi.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210916040755_1058804308.pdfIn PDF document text
    • http://envigest.cz/upload/file/51973722832.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a6dea62b2a2566dd58532d5ef69fbde7/42860622130.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142366579616---76713415156.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/17376155853.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/72567298618.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/92683299168.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/xijewemowute.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/73245663753.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/89574977606.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/17720486560.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/64431313456.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/85744710508.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_off0000b577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB577 10676 bytes
SHA-256: ce2b86873c9a40fed533331ecea594a06b4897da8bff37a907689ea6be856f52
font_01_sfnt_off0000cdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBE 16632 bytes
SHA-256: 8afd346737c61235c66be700dff8e4270219cda6042232ac38cc664405530c28
font_02_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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