Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92379ba3ff180f2…

MALICIOUS

PDF

91.1 KB Created: 2021-07-08 09:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 280fec9de3f293da5d5512d073f2ee6e SHA-1: a979bb77acfc61a51d099ca42a2081338f2c4317 SHA-256: b92379ba3ff180f2e622c38aaad1223041d9555e77c41eb4128057a3690281e6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it acts as a lure to redirect users to potentially harmful content. The presence of multiple links on disposable hosting and compromised CMS upload storage further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a123a2b8201---ruwapexik.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8673ccfd1---64675314013.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/147367a50349cc398ad2cfc40f367916/riparifededab.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/fepus.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16087129d479bc---jowoxo.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d3a3a9884---11950222580.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/1cmrknd10ff8783pifu0lmm9a6/jawiguporevopiruzefi.pdf
    • https://gberwanda.com/gbe/useruploads/blogs/files/lokijezumur.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5f533ae398da260ea660332cc3b4e33b/sixufebewijisexumurusor.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/jusapujawewitetewinesov.pdf
    • http://wsm.hk/images/uploadfiles/file/xedukuzaf.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/nevede.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b3f7d3d90---67425549034.pdf
    • http://ramenzoni.eu/userfiles/files/1073476447.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/tt1t7rag4sjcjcvbm6kgbj79l5/wufapogivolofozere.pdf
    • http://nmglyxx.com/userfiles/file/gisujiwitav.pdf
    • http://myphammonly.com/luutru/files/25476996637.pdf
    • http://naszymsladem.pl/upload/file/taderuxonewemazegiretuza.pdf
    • http://biolabsrl.org/userfiles/files/62466850245.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/34d23b460a8c060b0dc701fd6bc5148a/potalasuk.pdf
    • http://cokhiminhhien.com/media/ftp/file/gukenarizefakimunu.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/2aee3c13698c0b6134f04cd1976f4d3e/juref.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/botaoro94uailmmjb6gu7fg43s/17321635422.pdf
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/puserazetumejeredaxoj.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4cf378dfc1802a9360eef846cf495d25/36984835593.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/3b3211430bdece73b7e1bef2633898e0/73530037398.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7db547bd2---vurazinedavifezupaporag.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cost+to+dig+a+basement+under+an+existing+house
    • 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_off00010202.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 16792 bytes
font_01_sfnt_off00011a14.bin
554d418668a21dc268f088aeeabf0ed1486e2fc65115b66d6e186ebf6886782b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 16672 bytes
font_02_sfnt_off00014562.bin
8b6a1e297123a9b27b93ae7f0e584fc91455fdc22af98b8277274e73a2737039		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14562 11024 bytes

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