Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f79aa1b83f5df8…

MALICIOUS

PDF

91.5 KB Created: 2021-09-04 17:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 04e38f8aaca8afeaf96298afd1a9809e SHA-1: 094d3ae4ea1d3d98360c4b5a7ce53a3ba4640ba1 SHA-256: f9f79aa1b83f5df8da55c259ae02b2febbc4ad207040c6792ea9740a4d6be6c4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://infrive.ru/uplcv?utm_term=behringer+rd+8+manual PDF link annotation
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/3057b85709063c0aa6983af9d58b5b35/61141523953.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba352612968---numazoxamur.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24dccc7bc5---sibotofulogoga.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64cb255e4---sujelaril.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/dututalav.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/13216304324.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/sewisu.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/jaranariwavowubavuxupaba.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/87561244840.pdfIn PDF document text
    • https://fuoriscena.eu/file/21545135910.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ofb22rqh0p3a69cj3d6vi9gcis/dovudaluvexifiru.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b0c70f8ce---65654277744.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a902db1acb---dapixikozomizopifep.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/wefutimudolejufugo.pdfIn PDF document text
    • http://donghotam.com/luutru/files/77700428256.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/87850756004.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/22134ddeebcef4c35e64eff0c301bce8/40865720432.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3739a65dd2---mokijexetuga.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2d1624agem8ho770fofipbiinq/xemuxixofubarilejonef.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/56573164040.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/50049047795.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd2d528d4b---zijumew.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_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 10668 bytes
SHA-256: 0cef5a8c7ff38712a5c4257fe4a5c871746254e734803957e822e595ab3c392f
font_02_sfnt_off00012c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5E 19728 bytes
SHA-256: cb3c2111c4cf375deff92f5f882a21314e0fa10b3d1b7a7a362e1537937a5270

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