Malicious PDF — malware analysis report

Static analysis result for SHA-256 8637e11ffef9a66c…

MALICIOUS

PDF

77.1 KB Created: 2021-09-26 17:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 31846c221c104944de679ef8f075e80b SHA-1: 463b2d6454ab5d5b96279e4ed5cc40beec057e57 SHA-256: 8637e11ffef9a66c0cae1ccab2de7dcfff298284ae26b4fa67100b338e316405
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://pixomot.ru/uplcv?utm_term=fantasy+games+for+android PDF link annotation
    • https://cancelaria.pl/galeria/file/ligodemuv.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/24679257028.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/dukepuroxopovugunitinu.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/53820548576.pdfIn PDF document text
    • https://talaa-obour.net/webmisr/uploadwebmisr/file/xesedatudivij.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130411975d5a---93044306865.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614559520e437---wosunafixovowizik.pdfIn PDF document text
    • http://master-vin.ru/files/file/pevijudofaxitebenilesira.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/78851276949.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/22607492778.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/mumizeger.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/valuzowebo.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/44616387886.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/xajos.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/lafiditudasidom.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff9b981ae---pufexisiwelareromuzesabi.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/gaterilesidesitufopiketoj.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16150649bb9403---69942562785.pdfIn PDF document text
    • https://grancom.by/upload/docs/rojuxaxapojolekej.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/97040016611.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/21180715209.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161480a129ee20---jerikim.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/csh8ok50q7pnko2fg23malor70/jobirewulexaxowulu.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_off0000c32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32C 19456 bytes
SHA-256: ffc84e0e60b3c46529ef20fe6c990dc7609cd5a9339a1b768a6f88ce801848c9
font_01_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 10744 bytes
SHA-256: 9f87df9b5f8a23ba8e0b214741ca353ca5116c7aa0978faea340dd1834b14398
font_02_sfnt_off00010eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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