Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b4a15030711d65…

MALICIOUS

PDF

90.6 KB Created: 2021-09-16 20:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a2a568661ada493ccf704a348dc7cde8 SHA-1: 16576816d0e2abb7ad156f6330e0ea5c350df261 SHA-256: 79b4a15030711d650e077b7ba2602985a87e4b4e0dbe24f6a0e892ba3c74d381
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The presence of 'utm_term' in one URL suggests a phishing or marketing lure, likely attempting to trick users into clicking through to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://ketchas.ru/uplcv?utm_term=lock+screen+iphone+apk PDF link annotation
    • http://satyavnetworks.com/fck_upload_images/file/81567261645.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/funir.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/pigufitijetasi.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/busajedijopozebuv.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/moxijetivupipewujekegufar.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce50c99d0---pelonoxigujapufami.pdfIn PDF document text
    • http://chieucoingason.vn/files/92198448216.pdfIn PDF document text
    • http://land89.com/ckupload/files/96847345182.pdfIn PDF document text
    • http://vhz.cz/user-files/84627203252.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/38836827676.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/remugitaz.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/rujufevemiretemapamafiz.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/58794089971.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/58366696065.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/36756432885.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/22116011457.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/juwim.pdfIn PDF document text
    • http://agmapure.com/upload/files/11077493561.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161409583920b1---rurisumup.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/79292116610.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133290427ecd---66004873327.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/79930296271.pdfIn PDF document text
    • https://protum.se/file/22730457361.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA72 10376 bytes
SHA-256: 5ef092e8d96f24d913d3997e5d0e23d10c998b44b7f944f332d19d68ff4daddc
font_01_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 16436 bytes
SHA-256: 6618a7a3d4f3d45f7d046991027bdbfe2da0a049709c0836f7535001ac90c052
font_02_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 22972 bytes
SHA-256: 2e757ad9ecdbfb17ef9cd59f47527b73ccd054ff94c6b7a0293ba7b1a84ab89b
font_03_sfnt_off00014477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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