Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3136bcd506c64c4…

MALICIOUS

PDF

93.8 KB Created: 2021-07-08 23:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec21d4d463f8d8f39d880713f441340e SHA-1: d4eb83cddf62167c8f2f8f10ffcd86271e57ac37 SHA-256: b3136bcd506c64c4eea16a633837536e12d95045b31d59fff0e2a9c844fc0ad4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://casaledellasignora.it/userfiles/files/fuxit.pdf
    • http://bygreenpure.com/userfiles/file/68457826542.pdf
    • http://gtshotel.it/images/file/giruxekopupivasobababub.pdf
    • http://seednseed.com/admin/fckfiles/file/xizexijopogepi.pdf
    • https://bravo-hk.com/userfiles/file/dupiponafixupuwos.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb8776b298---37850212225.pdf
    • http://beiwendq.com//data/attachment/file/81732807414.pdf
    • http://phrabat.net/UserFiles/File/judipagija.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ebadf2d003c51a00dad0472c23cd274f/webodamidojemesum.pdf
    • https://readandenjoy.ae/userfiles/files/puwanalekudegubazitodo.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d97c609b911---wuzijapasun.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1c674040c0b1a1cb10fbe9f46edc5135/84308744418.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/nifewofezivumizuw.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b28b10c279d---bijifen.pdf
    • https://bandai-k.com/userfiles/file/70614940945.pdf
    • http://agrobud.net/uploaded/file/44778439846.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b84f7bc49---25175557933.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/79915941479.pdf
    • http://bjsprt.com/uploadfile/file///2021051006530625.pdf
    • http://amuseonline.com/absite/userfiles/file/75096688320.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ffdafb29ec58210b595d1595a5d2c96a/wuvesisawujekanugadel.pdf
    • http://dvarenda.ru/upload/file/90482823612.pdf
    • http://sushigonewildtogo.com/uploads/files/fosarufemudakunuxotu.pdf
    • http://jfk1969nola.com/clients/873000/File/dewoxenuregug.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sample+neuropsychological+report
    • 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_off00010b71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 16792 bytes
font_01_sfnt_off00012383.bin
f0ac90275ae66352fb9d905a4e555a0a55f341a5fce8d0e964cb866c5c7e0807
pdf-font-stream PDF embedded font (sfnt) at offset 0x12383 17176 bytes
font_02_sfnt_off00015061.bin
f6a9fbc44a7cb904acb4249294f60f9bcde782c43db573a0314f1f4667fc5077
pdf-font-stream PDF embedded font (sfnt) at offset 0x15061 11108 bytes