Malicious PDF — malware analysis report

Static analysis result for SHA-256 012bec2b27ce7bcb…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 05:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc5608224aa2896e8d107b6f2397d250 SHA-1: 3a1fea0db7e15ff2e16e019d360b3091f3c96471 SHA-256: 012bec2b27ce7bcbef49abab440eef8df72469c334e349c6fbf486784b7817e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites, under the guise of providing a PDF reader. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests a phishing or malware distribution lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=pdf+reader+full+version+free PDF link annotation
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/24d60bbf2dfe32823f7f7c37753ea48b/nepifugonapekoduvuk.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/95582700743.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612b831b7ccb3---zinamikozopa.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/rosegepinaxeduxun.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/pitiwijofed.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d78fbf6c52f78f705d93d7ad1f16336d/wuboratazu.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/99324474671.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/14381061122.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/67628971032.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/zukibizira.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612423073a60b---solop.pdfIn PDF document text
    • https://tipresentoio.it/images/file/vusubomozut.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/zaxoweka.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/jujoleduvizujotipasakim.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/49304657705.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/1949026920.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/gn1ecgnd50br57md56fc0qbrsr/pusadubugosolukolaf.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/zugeduzugasopad.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77ec02d93---30257613401.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/5151814286.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/56022870553.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/61248963201.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/mifinuw.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_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 10416 bytes
SHA-256: 96a7cac02517146cc5ef283ce05d4c1ade6efff164eb1f2ad68ef66651ed772c
font_01_sfnt_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 16684 bytes
SHA-256: 6865e04a117d40b6b2f445b2216de2285cb4e3f30f6839b0d9d656a0b6f85440

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