Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0df7cb10299cb3b…

MALICIOUS

PDF

81.3 KB Created: 2021-08-20 22:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73db679be2cfa3fd08c780686233f1ad SHA-1: 9cf78716ee41dc7fea3f0aff99eee7ff03faf0d3 SHA-256: f0df7cb10299cb3ba2ce709ac6aba140b2c88f7fb0f8560876516badd9e10b06
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs and the PDF structure suggest an attempt to exploit users through deceptive links, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.profiemg.cz/upload/ck/files/66774467939.pdf In PDF document text
    • http://lblussana.it/images/file/pisafinorogirexi.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/83423684258.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/ziwaxuso.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/2363455728.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/kimolexu.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/manujorilodovelamozifu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/p9chd42eqqdqf0fnrp327c5ju4/35211974696.pdfIn PDF document text
    • http://patroha.hu/file/gopevinepase.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/23967847827.pdfIn PDF document text
    • https://chp-travel.ir/data/file/lalatekivinajumesa.pdfIn PDF document text
    • http://chieucoingason.vn/files/rokegexesoxofibafufiluda.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ce8e26ca19a4c1599fee06ad04ef69ea/6904577407.pdfIn PDF document text
    • http://allasclub.com/campannas/file/52019597117.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/pudikilu.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/905680707.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607732095ae5f---94980798772.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf361a6a68f---30664906768.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/radotaxetuluzowuv.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/rvg8o40la25i521vqklpddueb4/wetiw.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/77016278821.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/68555379309.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/vunupemizebokupojawivi.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/simiwusiwavupirativi.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/ljbqj04rjgdsi99178u4g8v228/bopujefimowif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+pass+driving+test+first+time+floridaPDF 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_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 17484 bytes
SHA-256: b40737cbb7a3daf07de70990a7f3cc1cbc384f4ee3a89ff8d7e1fd65e94e6dda
font_01_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 10984 bytes
SHA-256: 64d7c75b558cae2df7a7a35855e7847dd79288c4c3224bcf7da1e2070a240360
font_02_sfnt_off00011f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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