Malicious PDF — malware analysis report

Static analysis result for SHA-256 0995d7c37ef16354…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 20:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c71821f9e068dcf53aeb2d9a9cfca909 SHA-1: 77f59b577e825e6eb2ed4c9a606c77b188b125a5 SHA-256: 0995d7c37ef163544fd92bfda2ac3241e7cf21af03cbb6608eb879e0e741bcc5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/uplcv?utm_term=five+feet+apart+libro+pdf+espa%C3%B1ol PDF link annotation
    • http://baloneacessorios.com/_upload/file///fumadevenoxivobalujaxexan.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/19638095050.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/85028891576.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/43098666520.pdfIn PDF document text
    • https://silga.ca/userfiles/file/majere.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/6ereduk9ur0hit79ltbr6ffga8/41824004237.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/78574093760.pdfIn PDF document text
    • https://12shio2.com/contents//files/13331239154.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bffbcee9b94---70017115044.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607426ee28da1---43856799972.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/bitewodelusuganaka.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/jawijutujevonilepotanevi.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/somemogalufeku.pdfIn PDF document text
    • http://parilka.by/var/upload/file/norekogulaxovokunojar.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b87819b012bad2f01cd33e1cbcb6b854/88959339577.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1627403848.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_off0000bbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCB 18928 bytes
SHA-256: 27c3a244bfa6517de66ce7738fd27cb266edd4350efd2463df630cf08a539332
font_01_sfnt_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 10776 bytes
SHA-256: c81b58a2c586f22dc7c8ade5d249cdfc70579d1c9d3e826dd2f391273247f91e

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