Malicious PDF — malware analysis report

Static analysis result for SHA-256 a958227b73c3df80…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 09:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59cf02569d88fe1be165d145287dc51a SHA-1: 8fd585dd419871acc73cfe7173ee4bb395dc6614 SHA-256: a958227b73c3df80755f6dc61ea402fd34fd0195e60399d38e4bfbd0f4ed5102
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URLs point to a common pattern of using malicious documents to lead victims to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://wastran.ru/uplcv?utm_term=accountancy+comprehensive+project+for+class+12+cbse+pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c55ec65dfd---40760236410.pdf
    • https://motelandratecuci.ro/userfiles/file/rakerezitavulinalogapur.pdf
    • https://abofahed.com/userfiles/file/81388712674.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160831b79b9890---zufewusoxiduselopukuwo.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/889c276ae50f8d63dbfcdbbd6d3817df/58843967778.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9e4d4a70cd482a3411758f79fa8cba11/23311468077.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160867e452bf51---75913980942.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10ddc77a49---gabejekemeviz.pdf
    • http://llux.vn/uploads/files/devijajetudivomoriw.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ac185318b4ae0dc1f15405d4b150d214/80317049716.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1c9bbbe0978b74839aa1374426dc38c7/fapidumage.pdf
    • http://tecresconsolidamentorestauro.it/fck_data/file/6337009276.pdf
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/23579726937.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094abf7e792f---jebazamejeronimebizatuxeg.pdf
    • https://maintogelonline.info/contents//files/fogugunomarulina.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/kexubajewovusapona.pdf
    • https://ytdrive.com/CKEdit/upload/files/15572628397.pdf
    • https://caffedisanto.it/file/90698534981.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4b29a0ce---nukobileduvemoreb.pdf
    • http://pogotowienaukowe.com/Upload/file/74749667410.pdf
    • http://gustosandvic.com/ckfinder/userfiles/files/sunuve.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/eejdfijp3tc8gosgvsbdjqe0p1/8624795792.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad48867a3fc---97219589717.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c721f0fdf---23071723151.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16097db165bff0---1154309341.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/33c56436d8494f26fa561244e518f0ab/wupaf.pdf
    • 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_off0000e784.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 16792 bytes
font_01_sfnt_off0000ff96.bin
45bfb88111f0fbacb6055c287aa9e63ad1d522a3584a14906f70c67fcfa4ecb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 17428 bytes
font_02_sfnt_off00012d29.bin
30ef954cc0de13c9bf506c45289cfc1bda77820309b63d0d58e0c7f293086d89
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D29 11588 bytes