Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcaf24a2c85de2bb…

MALICIOUS

PDF

70.6 KB Created: 2021-10-01 00:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 024d93828ad56497c56243e6ff92f67f SHA-1: c63453611e78013c56dc6ba381596497acdbb372 SHA-256: bcaf24a2c85de2bb38b500dfc17ea7c13dc9e56ba607683bddec7c5e4c413c95
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious, specifically flagged as a phishing trojan. Heuristics reveal it functions as a link farm, directing users to multiple websites, some of which are hosted on compromised CMS uploads or disposable domains. The primary goal appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://hulstcustoms.ru/uploads/files/50061772624.pdf
    • http://yourbuilding.ru/userfiles/files/16763394655.pdf
    • https://edubox.mn/uploads/users/0/files/2497454456.pdf
    • http://indianspringhomes.com/userfiles/files/vevizuvekususaliweravizum.pdf
    • https://butchercurnow.com/img/shop/contents/kaxubasunifu.pdf
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/fugarifilerepilufijabelix.pdf
    • http://dental-forum.ru/userfiles/file/jezukefid.pdf
    • http://piazzademarini3ge.com/userfiles/files/dovadiwepaguza.pdf
    • http://perchegouet.com/ckfinder/userfiles/files/gazitaxuwuralodupe.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161382d8defe15---94300991755.pdf
    • http://feuerwehr-mittenwalde.de/mediathek/files/votabete.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/77608373809.pdf
    • https://unibel.pl/pliki/upload/file/xobizupafaxuzikomesosu.pdf
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/busuf.pdf
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/72698931421.pdf
    • https://callmarkinvestments.com/callmark/files/21433518148.pdf
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/45782816306.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7a4eba5ec---sefizuzaruj.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2qk4v2kan3tgfok1q594epto7e/joxowukixesimuvut.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/uo7gg68fa5qug1qqjsgupmt8s5/67064338781.pdf
    • http://charolais-hessen.de/write/userfiles/file/davudebum.pdf
    • https://mudraconsultancy.com/uploads/files/91626327072.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f49dd1ff51---napepunowazibijape.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ncea+level+1+chemistry+acids+and+bases
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b22d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB22D 16792 bytes
font_01_sfnt_off0000ca44.bin
a53f94a66051dc96a3bb2c2cda320f0680facbce61c6e91ea4d1e0892a350a18
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA44 10864 bytes
font_02_sfnt_off0000e338.bin
9e6387e05268b788b96f4c52e3d60d40ff5fb8fd8cec3592033fcb4971dec578
pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 15652 bytes