Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cba9d447c2f47ed…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 07:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f66d3f1250897ab0300ba1e5be338f3 SHA-1: 6bbcaa219eca24656c48f632935fbfb2574ed823 SHA-256: 5cba9d447c2f47edddfbb5a900158815fdb37f1b34c6405f3beae7d22dc29dce
156 Risk Score

Malware Insights

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

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 CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://exmar.it/foto_fck/file/jewanafuvevawidibegeki.pdf In PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/pesaru.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/23036612965.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/k7a2i5t22hqjsecptm3ngslpdq/3798109159.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/13nff0bl4apqgngv0oi0i7d8vs/rusevelevajewimejidi.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/fejivudunagezofalebijolam.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/58417345496.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a18e7a2da99cc025d331f4a105462c87/13547934884.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/28819882224.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/64610172499.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/38685080657.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161132095eb82f---88594891948.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/6a66fb36be7ac3bf07754540dfd93868/dirovowire.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124dfa74fa66---dabawotimonati.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d910b72ec515f5ae5cf5849cf401d760/71959109439.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f06dc7482ee65f70d682f8976cf5f05/37250975058.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1dda8557f---24005124607.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/sofemozevore.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/11324386545.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c898e4b8b77---92698373422.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/73ecj4fvliu20aum1j6to28091/33633827835.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/24856134357.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210707075318.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/vuvuxizominejetawale.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/487fa2d960085f5ffd447191a4a739a8/patofizunizujeluraredapel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=symbolic+logic+im+copi+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 18352 bytes
SHA-256: 457563c27f44db0e0c48c2813ee0beaa8d8836373b90c32b3e81c529c6ba460c
font_01_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 10528 bytes
SHA-256: 866a76ae7ed289fdc0a16b622407c4c0a7ad8aa87c41b7b76ded45b4eed0e6ca
font_02_sfnt_off00012506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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