Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8138ebdec471578…

MALICIOUS

PDF

78.3 KB Created: 2021-09-23 05:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45274c86cdb2cdbf072ae270f5d53d15 SHA-1: 7029cac6b339e7dadbe941c71e41252371e39c6a SHA-256: d8138ebdec471578bd983a2ed53ba22c12ca4762e7b8d6e983f5d2df1ecfdd33
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 domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of 'utm_term' parameters in some URLs further supports a campaign-like distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://chcial.ru/uplcv?utm_term=jackbox+firestick+apk PDF link annotation
    • http://smartpaintingplus.com/userfiles/files/4565086711.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/nigodowapanivovurunomibi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161489183e5623---10861402109.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/69371608573.pdfIn PDF document text
    • http://sergeybazarov.ru/file/20996380205.pdfIn PDF document text
    • http://partnercable.com/files/gomogedel.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/idm74c9e434np700l789slfmbr/garozofexeribipit.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/57390901002.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/morovawedigigozakotajes.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46933714280.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/63756199196.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/86108500332.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/36056110585.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/jevavizujalol.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/99924187806.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/6289440219.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/670522acae5234efec8ead48fa2db675/52503371679.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/98340806374.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/wugugiwetok.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/tefuselixi.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161477063c5c50---tifiwuritidazuvuxogod.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/kawewoxaxufab.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161454305631dd---wasalinagiveveji.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/vegepo.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/94610592579.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_off0000b510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB510 18268 bytes
SHA-256: e677b8404097465840bf21d1c07d0ddecd7e214432e7985e4ed26a8159e343b9
font_01_sfnt_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off000110ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EA 10648 bytes
SHA-256: 644e96149be0f2ee3b6cb0145f99d0280917aa1a1d83173b976f77fdfaff3f04

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