Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f33a22ad05eabab…

MALICIOUS

PDF

78.7 KB Created: 2021-06-29 19:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90257941ed93b9860c0a1991d0920d3c SHA-1: 64abd186de1d0388b644bb191ab8c9db93803736 SHA-256: 2f33a22ad05eababfd1aabb45d21516b9b96805e70060010f5b993108ae5d47c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608588d0ec18c---64042856604.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941566de3f6---jiwivuna.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608700fb2ca1a---73389608884.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/tlcstod40iepmjat8ec3o63fjj/nipuwetatomoxuwamav.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f846dc4fe---73832051568.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/04a9a37eef49f811852e7aef7c061d36/81042183140.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609471d164610---gufumisoxepewapizebo.pdf
    • http://apisicul.com/userfiles/files/3477892588.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9c3a11aeeaca8432f41fc1978d736143/28839645280.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b9e507f3a74---voraluxamabisa.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c46fe5216f2d949ae211f317ed6a564e/xojobokokudumuladafosiko.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5b5a13bc---wijuradusizopinoz.pdf
    • http://kamnitikamini.si/upload/files/41306887477.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160cecad309db1---fimarotemusiripusazoxa.pdf
    • http://nakajima-ya.com/upload/save_image/files/47362418416.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a25978e2b---mekagasa.pdf
    • http://autodilykanka.cz/cmsimple/images/file/34128835533.pdf
    • http://agcslohian.com/userfiles/file/jupivu.pdf
    • http://innotec-industrie.be/userfiles/file/61262872375.pdf
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/bifegotipi.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205629a279---12283688021.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b57231334c---xebajevudolaralemanamij.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/98514c0f6d578d286ffa667eb67b8f8d/tanufujuditesa.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098450827e5d---45809887502.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bahal+and+bahl+organic+chemistry+pdf+download
    • 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_off0000cf31.bin
df007a1cc721da072d2472fce0b954f1fa3b880f5f026073ab5f464ff25b1d43
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF31 11460 bytes
font_01_sfnt_off0000e9bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 16792 bytes
font_02_sfnt_off000101ce.bin
07b027f3ee19863f374c5cdb033ac1c9e118e71733fd47901a8bcab27e667dd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 16864 bytes