Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9f61f6392ed7e0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 20:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ce00e3604f9530be09aa4c8c21e794dc SHA-1: 36b438606b3f05d8ae4b8da74e0ad1a0921a660e SHA-256: 5b9f61f6392ed7e0162c9c3fdb787364f851a024af3d7ff8bedb9b7e580a9b58
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites. The primary purpose appears to be redirecting users to external content, likely for phishing or to download further malicious payloads. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3f2e70231ed687be9710173e98afc981/divuvibogomimaji.pdf In PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/la0cffh8ecd34non43i5e9rhpe/xamusaloniwa.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/75544021339.pdfIn PDF document text
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/kudubebofopod.pdfIn PDF document text
    • https://panama4d.com/contents//files/nobisuzir.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6f2311e42b17087ac1eb8a1cc6019fd4/mogojelanefiwigi.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/57247075486.pdfIn PDF document text
    • https://baglab.pl/galeria/file/buzevi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecafc5b237---fazipegesoxemimaxedaguxi.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/33016341782.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/42524160610.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/67870701914.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/66241426525.pdfIn PDF document text
    • https://arerp.kr/data/file///zuxumomoke.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/45518902942.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/73492206954.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/nixovobodupijenuzekapazeb.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/zutetikerudusedu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/90912547920.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/8703636737.pdfIn PDF document text
    • http://kaies.net/upfiles/210813184337873163u2zc1t.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb727f10f---xevojak.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/43895887342.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd850ef98b---87861118201.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/koteramix.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/sojaretavililujel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=classical+mechanics+by+rana+and+joag+pdf+download+freePDF 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_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 11472 bytes
SHA-256: 4862323680f06981afe724cfb4206383b69b35ca63375bbb83139bef936e8626
font_02_sfnt_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 18160 bytes
SHA-256: 39689e78c991e6c236f4275539de31308b87dfc82bdecb5c26bb4d43c020b66f

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