Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9380efc29b7874…

MALICIOUS

PDF

72.8 KB Created: 2021-09-13 00:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 761bc88b59bde929427f1b3827d9dcde SHA-1: 3fb90d2d198668d93ebf64bf6360cedbf14dc5ee SHA-256: 9f9380efc29b7874c03e9cc93806f5ebea23aeb20ea871632be3c4b6ab22f45f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links are likely intended to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135932febf5a---5516845875.pdf In PDF document text
    • http://mgocsm.in/userfiles/file/siguwegejajoxir.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/vexurugujukewasusudesumax.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/84380604419.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/mojerimebevarewivizizo.pdfIn PDF document text
    • https://inks.bg/userfiles/file/20115453119.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/76254757600.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ab7d7b9c---golukovidat.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/74244728255.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/080213238709.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa8fae08b---kerinitufez.pdfIn PDF document text
    • http://orderkai.com/uploads/files/poxifo.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/61392620167.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/25819941547.pdfIn PDF document text
    • http://poorclarescork.ie/images/14485887688.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/rujepowobajuzapagaxufu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130be315cec0---lubewidivorebekiwidazo.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/73763278636.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/68323968966.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/93607135582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pasar+contactos+de+android+a+iphone+appPDF 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_off0000b5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D2 10564 bytes
SHA-256: 7be120b60911364feb180675ea8c6d9c71a9c686174b052425aa6897af3d3434
font_01_sfnt_off0000cddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDF 18772 bytes
SHA-256: 8e0d1a1f777d86f4428f505415d03f7d7de6ccc23afc3647c8c4767999e1fe3c
font_02_sfnt_off0000fde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1