Malicious PDF — malware analysis report

Static analysis result for SHA-256 c952cec6762a75a7…

MALICIOUS

PDF

76.5 KB Created: 2021-09-02 22:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c6f5dfb70e2e22918f01b0f68fbe753 SHA-1: 17df58bfb22458ec004ed8b825d6fb8832905ecd SHA-256: c952cec6762a75a705f5bd49e4845f7f0614ef583ea9faee9608cf66c10286fd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a phishing or redirection scheme. The presence of a link farm on compromised CMS upload storage further supports this, as it's a common technique to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://ricarda-allegra.de/userfiles/file/97467770470.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-4/20210504132049427120.pdfIn PDF document text
    • http://alkanboya.com/files/file///pokejofozebixatekajetofu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/nunoxiwowapetevenopewexe.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/92522744148.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/baxerobedepiwoxibik.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/radanevilatufomirufiv.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/989ee2f0b0edf1614827ce3f7a7401c7/gezewifasu.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/besilebavozawibovifajidiz.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9d2aab8441b46f60fa88731039cb4b34/96027444831.pdfIn PDF document text
    • http://e-district.org/userfiles/file/gaxozuginokixikig.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/kefoloxeweribaxip.pdfIn PDF document text
    • https://silga.ca/userfiles/file/50147278373.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/dizex.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/15798156355.pdfIn PDF document text
    • https://rajaunited.com/contents//files/jaturaba.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ji5blmhdbhtgfuf5hj8pqmmk2h/kanafutobemazedo.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/0c19d9d183d1494220221755201d907e/82041111457.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/75197610504.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079b16f1f3c8---ropowusexuxanopor.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/kiwisufenopaxajizip.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/unk6om3gh8tpn9l5d65l6gmq0o/59420806503.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/ziwifemugiranun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rotate+pdf+into+wordPDF 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_off0000c902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 17372 bytes
SHA-256: 77afeee89291cbd8607acd0a2a215c9be5aa882368ef1696d9dec4675473c297
font_02_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 10408 bytes
SHA-256: a8816c3812c8df96c88641bb47af68fb8fdcc4dbcd5beaa59c17588676a1253c

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