Malicious PDF — malware analysis report

Static analysis result for SHA-256 663aae22b09cf1ba…

MALICIOUS

PDF

79.6 KB Created: 2021-06-29 07:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2f33fd637069b24b0834e32c0d4326d SHA-1: ed72a9fce363a9ecd2500b781185b9b544693191 SHA-256: 663aae22b09cf1babe7542a326dfeee9e81b761f85ac3d463bd0d37a42de5d4b
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload locations and disposable hosting sites. The embedded URLs suggest an attempt to direct users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://web68s.com/upload/files/27437022244.pdf
    • http://fapannimario.it/userfiles/files/10444454042.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/wuxejuvumafowebapibid.pdf
    • http://www.prieteniitehnicii.ro/documente/file/jezujuzovodarifu.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca566bf5c5---fuwisugan.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2089a0320---17968329255.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b66cf1235---2397243129.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/32625567306.pdf
    • http://bobas24.pl/Upload/file/tasogigenivug.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6e32f9c02bcdae3e5a045bd55f925168/miranuvabulobasebami.pdf
    • https://chezgregoire.fr/userfiles/64600475522.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dd1222ed3---fokidefi.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88a98c258---15904667447.pdf
    • https://llibreriaha.com/img/events/file/98278829615.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7f752b3493466c025726c90784d8e53c/nawadabax.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/aaf367b0a9e6e73ebd299580b4be9653/90721714112.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/vovokatodujegu.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081c7ee07f3c---36466930877.pdf
    • http://myucmas.com/userfiles/file/56317281427.pdf
    • http://tgtech-auto.com/userfiles/file/30358767889.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609082daed12d---farozunesuwiruvix.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/677c31bc03009ff03062d99e2b3c87e0/84397272877.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-2/20210502032429744564.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/7e4200626cacf8b8d03b61e271193bde/zovisofokobikajanegogaxur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=this+is+ironclad
    • 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_off0000d12f.bin
d724e109098d27e840aaca747cca11b1c3b21bc4501c6eeea4e51658480501e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD12F 18500 bytes
font_01_sfnt_off0001014c.bin
d732b4c67ca311ac65b3464f984295235ae9f4f02bcb127d9184c0a3c684b8ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x1014C 10200 bytes
font_02_sfnt_off0001180b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1180B 16792 bytes