Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c378fdcf53a5f5f…

MALICIOUS

PDF

88.4 KB Created: 2021-09-08 04:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 10cd62b532f8fb77d3707e5f7f8820d1 SHA-1: 05a40be5895794a361184fbdd3afd2fedd6fff7b SHA-256: 1c378fdcf53a5f5f9c10b251025aa3ee2d06c8377d7c3c50e90d4da4ddc67ec2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous external URIs and a link farm pointing to compromised websites, suggesting a phishing or malware distribution lure. Embedded JavaScript was also detected, which could be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=transect+walk+pdf PDF link annotation
    • http://fli.edu.mn/ckfinder/userfiles/files/78877794897.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/mokadorajesozi.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/nafemofubewokojorawon.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/20852669489.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609874b6a008c---86487222504.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf29281c3a---bijib.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/kodilage.pdfIn PDF document text
    • http://tabletopad.com/images/file/guzenisofumamorulajuv.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/dafodusumemidukowu.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/xevopaguvofolebemegumen.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/09ac630be6dfbc599b2d6569ca8a38e4/nuzofurigizebav.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/88135830387.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/86544544069.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/vurerogeregodewesilu.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210718214837.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/84377655547.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tevemujurinadujene.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3176740a5---23647680161.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/gemenujudiv.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/nevuxal.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/pebobusijewa.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7aa50f97---rivufunoruzenix.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/vubexakujinimow.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_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 17420 bytes
SHA-256: 262cf37deefef6bcaace38550d0ee993a1848f60ec932ffbffda78c38a843c84
font_01_sfnt_off0001241a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C31 10544 bytes
SHA-256: 18c776720257a0b18ccb78dd8282305cbf59e1e4f7c4295c2dd0b47e4b5231f8

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