Malicious PDF — malware analysis report

Static analysis result for SHA-256 e928515c10859633…

MALICIOUS

PDF

98.3 KB Created: 2021-06-28 07:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4415377abc52bcb62bf5145dcf322778 SHA-1: b33249e86179be49620312f34050d7c3901fab5f SHA-256: e928515c10859633cae4162d84d06f19387a53df933f3492a7ce5a0930f618bb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it with high confidence. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://meble-tk.pl/userfiles/file/mabinabavugajasufalaba.pdf
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/sewamadedomanipef.pdf
    • http://clinical-pain.com/pds/userfiles/files/87007789173.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/gosibepowanareziso.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc829c4bea---34363854912.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5fe09c39---nubuxupufiv.pdf
    • http://flynewsletter.com/uploads/file/79328237274.pdf
    • http://arniestribu.com/campannas/file/xebevadige.pdf
    • https://globalmediaminds.com/uploads/files/87421992216.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077390714c94---kizafikagimafitusibi.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e463bbd7cabd0a68d8b30c7fd1f5ffe2/kidogoguna.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ee3511ba8---xifuxipejujis.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074975d7fc8f---35462001450.pdf
    • http://mwflower.com/upimagesfile///pipurubapuwikuker.pdf
    • http://ingenermarket.ru/userfiles/28491182429.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/61752271147.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42513fc66---27037595688.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160897d1461c15---65578769480.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/aea48fed90b0e96074f062b568b3245e/paritov.pdf
    • https://digireg.nz/upload/67045742031.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/bipur.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a304b8bc7---filolusu.pdf
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/99810331431.pdf
    • http://kinel-hunter.ru/upfiles/file/raguvotukevejovopigo.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6449eef81dd2d33c6fca76f48de301b7/32151948826.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ucsd+junior+standing+units
    • 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_off00011d82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D82 16792 bytes
font_01_sfnt_off00013599.bin
ae921f9eeb9ae026bbbba1fd49c18fd445870089792a85fd9a445169ee11faf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13599 10604 bytes
font_02_sfnt_off00014db3.bin
69b6eeb6ffede274a3bbaf509634dde0196e3387a337040ecfd5097466c3317e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB3 17808 bytes