Malicious PDF — malware analysis report

Static analysis result for SHA-256 322a77058552f0af…

MALICIOUS

PDF

116.0 KB Created: 2021-09-05 05:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f9336c538d643a39b87496b35b6b69c SHA-1: 8060e7c2b4b54e2e6c44487fac78e30748364a73 SHA-256: 322a77058552f0afd682bed40d77c63d0ec1387105afb82e63a844ece8b68eff
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://arte-salon.ru/upload_picture/73076205151.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0bd7876ee---zubelokudatudez.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/jaxaku.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/caed4ee8d33e35540239583241b5310e/katisazurisixevemipufiguj.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/xuruloxof.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xizukasi.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/fadonoxosobi.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kolapasarepazuk.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/7032219846.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/fibiwivejiranuk.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/50484429987.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/weteduwaposabapobuk.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/wededefuzumakulimavita.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/luvaxirofaranapozumiga.pdfIn PDF document text
    • http://th-hl.com///upload/files/99766263297.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13655757569.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///sosizovabajuvunipewol.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kcf63gev9dk3f4cad1466mj4oh/xexumakelatapadikefared.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a772da4a6---47246033051.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/buzuzegekukurowow.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/mozozoguxujodurexu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161155c5d1fc41---vakibolukowibedewosabara.pdfIn PDF document text
    • https://tigapilar.com/upload/files/24226060408.pdfIn PDF document text
    • http://kite-surf.sk/files/28859036825.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/91125445193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gedichte+stilmittel+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_off000154f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F7 23876 bytes
SHA-256: 2b85555bd9deb51d6c2a03d43e59aa315da0d0b2a588c4e7c3d6737e9b564240
font_01_sfnt_off000190dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8F3 10440 bytes
SHA-256: b84c0106d9aecb8fd4d84dd33976b968e38d1cf6df0e6828508222898c8756ac

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