Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff59d76f8de512a9…

MALICIOUS

PDF

90.3 KB Created: 2021-07-03 09:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec8f6d7a802fa49ff7cf9f7e3c53a1f7 SHA-1: d642dd9ccb9218f65731339aa2fdb66d6f8eccbe SHA-256: ff59d76f8de512a943ffe185c8b0c91f6720710324228aecbbc9056f756c4497
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various domains, including compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://shipsupply.ru/userfiles/files/4556015287.pdf
    • https://sanruouvang.net/images/uploaded/file/51649129770.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fada9e02eb---96244888836.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a713b44ae4d---dulimimevegajuwad.pdf
    • https://ancoraeducacion.com/images/dibosuriwekizatitiz.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16081a819e2422---jefabapavomopozeti.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2cd4f06a8787c52ad227004894a1d70f/buruvaxibijinuvawop.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6990f150082d07c46bf2ad2918cc245d/bizujofazozoporu.pdf
    • https://gloriamus.org/Uploads/userfiles/files/39470678010.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/0321965562063cbdf9cb87a6fda7e554/99224537009.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079340706df1---90493504969.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/b69686d3aa7c0a9d213a74f102b4238a/felijibo.pdf
    • http://cec-intl.ru/app/webroot/files/file/92893200498.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/13a85e3b52e1a373a6dbb43b6b2dec57/nuwuze.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a870b269850---zowebufuzedesasofugedowa.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a839c8f64f394f2de285c2da504c9a2e/69135103965.pdf
    • https://liniagdanskzydowo.pl/files/43945330810.pdf
    • http://easternsheep.by/app/upload/file/xipezosabumaf.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7ba262530781b7a81c1664bd5e615fba/jomokasiburuzerib.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/5ei86op7t70jfuivjvceckcjuf/17529615917.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=attributable+meaning+in+english
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e220.bin
5eff855583601ae88bc3f4bb4f13ad78eba67902aeba2336624780395ddc5517
pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 10656 bytes
font_01_sfnt_off0000fa4e.bin
313b4d1b1f982e25284d2f4e6caf7c0c7767db1f375da95b613bc7d89e59efd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 16064 bytes
font_02_sfnt_off00010f60.bin
36e2ae3848a13b32555504b78982080722001bfafdf33f9be45c973188f35884
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 19220 bytes
font_03_sfnt_off000141d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141D8 16792 bytes