Malicious PDF — malware analysis report

Static analysis result for SHA-256 67be97aabaa6fa1b…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 12:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ba48221d39163a1d00accc7a3d305d3 SHA-1: 52c8e203cd995da79900874e629dc69ae5ecafbf SHA-256: 67be97aabaa6fa1b5642b5cc1c61de0b1aad8b154aa9c68daa0b4205ca80da62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=converter+arquivos+para+pdf+programa PDF link annotation
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16106eaf8819fb---77282764643.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/9610a9cafd68a0a0a4852cd45462dd30/94028618484.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609645bcdf6fc---jajogex.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0ad0d345c---mafavowela.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1593b7e53dca56182d34577969c950ad/60727061468.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/dodepefiz.pdfIn PDF document text
    • https://okna-kurska.ru/page_edit/_samples/userfiles/files/82560944243.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/zojibif.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ef3ae20997d0e61e6309934b4b7db06f/fiwufuxotem.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160864e5da5aad---89280032204.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/nuvelewanosazeviref.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/47611493169.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/buperisaja.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/9stc26793bf6ck3svp0sfpsqu3/20266515739.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/mejaxapufufaxosam.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/paxopam.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/48222625571.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be97074a3bd---kadidut.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/wukuzeribofokaxelado.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c866031cb---3354932330.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/kalenumuzijepoz.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/c9b4540bccf194eebe618b8028397485/71605002825.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609289d5db549---88719869255.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_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 18164 bytes
SHA-256: 60074069e52e111ab03aea9e66960a53822876a86924b1dca7f2c5d0336f0c13
font_01_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001357d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357D 11136 bytes
SHA-256: 7f4f83e855869a99d646b183f2df6924059f40e759c118edd9a593ac78b32de8

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