Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fbfe2508e246eb…

MALICIOUS

PDF

71.0 KB Created: 2021-09-05 16:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4eab317fe0583129589c50847631d1e SHA-1: 9d68c767170243d940b4a325c9b1e1125da85963 SHA-256: 44fbfe2508e246eb97d5ea6f1c7abddd77ae7e4b21cbe59a0d7d23cc81325e60
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://videofilm-tv.ru/content/File/zefedi.pdf In PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/9706a3d6199ac9bf6152aa11f7601317/fixujim.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/ur6jsu0run72j4fq6jk2d6s04p/mikewa.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4da40ce6428f7ba80e08cab3325eebd1/nikebovozitewa.pdfIn PDF document text
    • http://www.bash.cl/media/file/91027623848.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9eb20e9b3a---85362849239.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/sixidex.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01ca93892e---lojokumabifipomusizamavuk.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986caf05935---tugapagajowinosa.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/18872776142.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/5d2c13303eff609465a42a2ef5adddf3/rukodiwabo.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/penanimunajolowu.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/gudopo.pdfIn PDF document text
    • https://hojoairport.com/images/file/zogurovabawimizotasagegi.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/xuporakejawopad.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e4553f7ac---tujavoxipipep.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/getisosirabekasizep.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d66c853d722---xoxonudorajavilatabir.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607812a2410a3---18458521613.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/kitavuwakisuxedog.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/86654903297.pdfIn PDF document text
    • https://digireg.lu/upload/11734738147.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/14872f7e78cbb11aad8bd4d31b4940ac/sazotukumin.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/59422110417.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985fba90464---wutuzizifez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ecobee+smart+si+thermostat+user+manualPDF 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_off0000b92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92F 10716 bytes
SHA-256: f80e481ca520e6a8599aa55749e1c95d25be61472abd174d2f6e424172aee26e
font_01_sfnt_off0000d194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 14484 bytes
SHA-256: 5f22064207068ffd4d5c31a530ab3d9af074184e9a937cc345c2f5df91f3ccf1