Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f74d7be4a024b02…

MALICIOUS

PDF

93.5 KB Created: 2021-09-09 08:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec36d02dd0e0755d6eb3719c669f095f SHA-1: 4d7ca7b7d398c6b21fe7524ac937ed6be5366a22 SHA-256: 0f74d7be4a024b021155ad98d577f693bafb142575688632e0b0c329338c8b66
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garnizone.com/userfiles/file/vitudezija.pdf In PDF document text
    • http://thuduchouse.vn/pics/file/38408978307.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161392ad2bcfb9---pipunatidilatidadufek.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/molorotozujobopogol.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/90679665687.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/156908a98e5173389f38d196288c679c/komon.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/dubigebem.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355e0ae3edf---lafubowejarafejeperimakip.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/bebutabafefanumixesuva.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/27958086563.pdfIn PDF document text
    • https://satesayap.com/contents/files/75222018308.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e65f620bd89f21d9806f2c88b175ef1d/movozajinamozotuvameda.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/559e5ed0fde5bcdbffafb391ef1faa04/siraxevofijavoleli.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132f727a0b3b---xurafipivuz.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/58123698415.pdfIn PDF document text
    • https://kokomanis.com/contents/files/41862814437.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/fuxez.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/1855055964.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210908080038.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/6139036911.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161302a153261a---vakebaw.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613487256c731---poxekozax.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/jenogagujezakizidera.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/varurujezowovarunokesapix.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/zapufesafulatonopurisam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sonic+mania+iosPDF 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_off00010c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C77 10092 bytes
SHA-256: bb6f209b37bfc6d56d693666c58fe39a3eca403ccdb9fd690215ef755dde0401
font_01_sfnt_off000122e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF6 17392 bytes
SHA-256: cd5b77b87f6dba057fead53d09db79e31ef725259356a8689fa749d9b4eb5e5d

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