Malicious PDF — malware analysis report

Static analysis result for SHA-256 837ba94851301b42…

MALICIOUS

PDF

84.2 KB Created: 2021-07-01 17:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0d7f28c4f10a5ed990bdf754b61db284 SHA-1: 9a81a8c6493100ba49665793f844712017be0e34 SHA-256: 837ba94851301b42d22bb04de779a2142252b1cd38b3318ff70762372d3e4c72
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The heuristics reveal the document functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious domains. These links are likely intended to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a793b03545d---wedezewipumomatemifepi.pdf In PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/546fb0384fb749f59e9ee8e6ebdb366d/wiwofenunititulatedarage.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/1d1ddde4dcafaa2d1efdc9a4f9e3e200/75920276268.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/g36vmf2403qmbr3jdokq7re4n6/48321642158.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/davus.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/tagepisebemoso.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/vawawamikuresujavituv.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c74922ca83b---6473600017.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/kekeruvurav.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/gezikoxogudewita.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/di2l7h07mfj1q552k7bb238bst/saposubaw.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/zanoxofifupejotisobafigu.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e53766ae06c870412b43772b33eacc6c/21965469025.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021050712639_626260780.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/bewame.pdfIn PDF document text
    • http://askort.pl/Upload/file/kopas.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080f4f281705---betifesigis.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5c25704a---92340231357.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/ad350f81104715e55505b1d0228a0478/pewavipojikulono.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d04146241e3---kinojexelatebitesus.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607319e9b4ca0---43030545844.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/91269986860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hra+consulting+monthly+calendar+2020PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 11264 bytes
SHA-256: 20a1567cd34e40f208dbcff4bd731b13e4d8c7174fee72b5b073883ebfeaecc2
font_01_sfnt_off0000fefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 17492 bytes
SHA-256: c60dda90019e4228062f7a16b107c50ef60dacc4fc195b84c6f745dd8469afb9
font_02_sfnt_off00012b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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