Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c174dcda30a2adb…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 05:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d2b0980141610f7de12d78db577f8f60 SHA-1: 1354bcde7e6e6a32c001428fcf49b2d410be2085 SHA-256: 9c174dcda30a2adb8c63aa58f8102fed5a409402f9d6b897509de2979215cdbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users through a seemingly innocuous document to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://africanresearchcenter.com/userfiles/file/doragomerofililuxafinavan.pdf In PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/6e5459f255692324816016149a329b15/80808291513.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/barefudimip.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/nezaxitejumov.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/99577380307.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/lovafagewipijixaba.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/vusijavoxidaziwokojemu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/84121271952.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16080ea905c7e0---wabosog.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/padenidito.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/78892994466.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/wuzogidelogemiwa.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/gagumazidanuwiwebir.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/95b0c4306855627a8b4e95d22f295609/jarijof.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/sobelupi.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e282858f---jokokikawilusenarus.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/82001310488.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/tinavagasimepenudilafo.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/92544944820.pdfIn PDF document text
    • http://christopherdallo.com/file/20965559676.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/72c1261112eba1ace19efa5add806cd1/ruxavuresunit.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/golunageze.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16075e10dded90---50325326263.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/71505776449.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d77756592ab---zovetadakifuvajotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=andre+agassi+prepPDF link annotation
    • 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_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 10284 bytes
SHA-256: 924908b1cc132f6264a37a7498987ed67250b9825fdb189708ca50b5122f8b2c
font_01_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 18704 bytes
SHA-256: e5cff95e4bcac528183024eb9685349e481e0ecf2b8d136a69816c2a23aa5404
font_02_sfnt_off00012fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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