Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a617606802454bc…

MALICIOUS

PDF

93.1 KB Created: 2021-06-25 12:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c74d848304a91beb78f55e6f0017d49 SHA-1: 849f6e6c2b3baa421d0b730a89c226c7839b53bb SHA-256: 9a617606802454bc528c8ea7eb83e0e72ddc39160d444654de0ea77524352140
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://techson-cctv.com/upload/file/detovosurenizudow.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fb8342ff3f9f4535adcb6d8de002d7fa/26813528896.pdf
    • http://daotaonhaccong.com/uploads/userfiles/file/duvesuzovirit.pdf
    • http://apluskleaning.com/admin/images/file/62540362633.pdf
    • http://minhvuongthuphap.com/upload/ck/files/tepejulawiferope.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a694233d29f---gevirokewife.pdf
    • http://cesurmakina.com/userfiles/file/lobiluri.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c875ac41fcefbd070e1f73801b381d56/gubikorivonexerikij.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7e7330b2---67430955674.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608646226ed3c---teginig.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b727c7e39---45909987859.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b389b47066---bawumubotazizer.pdf
    • https://najlepsze-w-polsce.pl/uploads/japol.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64cd2ce64---44599350566.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcb90a477e---42053454642.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074adc91ff43---jarutasod.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2475fa39be---21631261280.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23ac4de50---wejubida.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=frozen+2+indo+sub
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 16792 bytes
font_01_sfnt_off000112a3.bin
8e7853b1263be14c0cdf814a1253500a51b6f9aca32a08018ee49fe0d29f7c6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A3 10332 bytes
font_02_sfnt_off00012a11.bin
cd406140b761198487ec9502e80ac637e4bcdb7dca0f48a9dcf47f06f9792f1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A11 3376 bytes
font_03_sfnt_off00013797.bin
eee362b6afb5658ee9e3b672142b9daefd4fafbbf0b545f7743fe93365c12963
pdf-font-stream PDF embedded font (sfnt) at offset 0x13797 18468 bytes