Malicious PDF — malware analysis report

Static analysis result for SHA-256 211f60e10b8ff87e…

MALICIOUS

PDF

74.9 KB Created: 2021-10-06 23:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 15d308dc5303810c3338f4b47fe2bb7c SHA-1: ae676047be269f839b3f9abdd2184db3c4f0dd29 SHA-256: 211f60e10b8ff87e979aa6f9e3360e79699153294d08db21d59f9d8a79a820ea
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and the compromised CMS upload link farm heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=spring+boot+jwt+authentication+example PDF link annotation
    • http://lagrupacio.cat/file/90563876627.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/xekubeniwuseg.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/kapamarilapajosugad.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/pituzifiz.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/73482089471.pdfIn PDF document text
    • http://acril.ru/ufiles/files/fepewidujepi.pdfIn PDF document text
    • http://e-hematologica.com/users/file/zejoxuxamokabadegetixir.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/widatiwewidikubopifi.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/25752762999.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/d6r656qftqdtjcuqhrhnur2tpl/31329360105.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/42585538371.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/mavuvivixudafutatetojipo.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/damufi.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/zapejigejagozogapegokeb.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c8f2f90c---puranoritewibulusexuni.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/nijizuvitupado.pdfIn PDF document text
    • http://mariancozma.com/_user/file/puwuvogederigulutewekab.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/35762052790.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/jagaranidazalukuwadefus.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/sokanorilovupirumefuzog.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/julabifotimamozepamige.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a43b805889---26437878482.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pazosobofemi.pdfIn PDF document text
    • http://hexindechem.com/upload/files/febagexepomusejopotetifen.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_off0000c0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CB 11284 bytes
SHA-256: ba1faaf4b059abf913a6e909ffe5317770081657e4fd1dad0ee354a7a59c9b12
font_01_sfnt_off0000daeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 16560 bytes
SHA-256: fcbe435b25b3518dd4c7ff755387c320c31ee08e01ea8559cf1efbf1ddc9a23c
font_02_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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