Malicious PDF — malware analysis report

Static analysis result for SHA-256 9092b58b6f04d08e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 14:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5d83127337f4a716470db54e9c9e35a SHA-1: d3b5408430f95e7dbb6629f3845ae72ac67b7b45 SHA-256: 9092b58b6f04d08e8637a2694851abe08ddd4ad363c32e01891b9ad6615f8194
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

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://flardochform.se/userfiles/file/werijexikenejebuwinikid.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/028td6r43qbpj8m4btb8te3fj1/nufonewosapamoredolujina.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/91888372882.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/29053925618.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137069a2d588---rakuzo.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/81603332338.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130a616d885c---salufanagudodu.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/lenilanoliruwirugitujobe.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/kirakikaxadurizupozo.pdfIn PDF document text
    • http://markone-tools.com/upload/files/99946021843.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/78436124292.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/xagawopubotusoxax.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/88371538158.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133590e8b214---2155758694.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65244027502.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/10351091814.pdfIn PDF document text
    • http://rs-entp.com/upload/file/37286178631.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/kuxebetojolevuji.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109082254133854.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/84442789089.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161303c6aa0c24---nidavi.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/76030178583.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613009d68a6c4---lixiwugoxedezegolegipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=designevo+logo+maker+mod+apkPDF 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_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 16928 bytes
SHA-256: da2854983551bf50bbcd9504bbfb4d056dba385717fe41ccf213226c2004d541
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 10796 bytes
SHA-256: a557516bb60823254937d8d8d62d93214b57099ddb1bdc48893ff01f5d08bb7c
font_02_sfnt_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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