Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af769914b17003b…

MALICIOUS

PDF

117.4 KB Created: 2021-08-29 03:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 853f016c12332b2e51ea007b54eafb89 SHA-1: 2571dcbb0640455f2b5c1600189444945617b346 SHA-256: 8af769914b17003b4747c363822fc1c13ca41bd945e8b2a3421ead140cd83b9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to compromised WordPress upload storage and other disposable hosting. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://studiogiamberardino.it/userfiles/files/65422034037.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3438e32328afb67bd2fc8ff3651d801b/25353446982.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5e0e8fe1e5eed84824f6b9c3577f5438/xobetimakadikobebewa.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/97531461778.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096112d69dbc---silamaze.pdf
    • http://mygiftltd.com/userfiles/file/somosunoluxopikogokim.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a6eb32ef---19934108914.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/593c19f756b24a8fb6ef32b65dcedbbe/jusufejudefig.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e079618dc93e7d27ed48787331e4f0a5/70292101775.pdf
    • http://ahzycw.com/upload_fck/file/2021-8-28/20210828180311230208.pdf
    • http://mevlanaasm.com/resimler/files/jodabasadutatofajafalefo.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/cdabb485a76934dc2d5a7083dde5def3/77346270177.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f140f973781---botat.pdf
    • https://langumeistras.lt/i/File/75858730320.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/87q5fnkg4fjl2m6fffhmnq3usl/vuzedemijitonafo.pdf
    • http://robwalker.net/fckupload/file/fodivupadixuv.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/32b262014f30baeef47de86acd2998bc/kigalutigutevixi.pdf
    • http://akademia-jedenastka.pl/zdjecia/fck/file/fonumuvitomomodafusato.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3c0fc6cbe---53924693362.pdf
    • http://hotspot-usa.com/js/upload/files/3680962253.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/b00733ce102f7b779f5405acea02979a/71999594857.pdf
    • https://asfus.net/virgsurv/userfiles/file/tubafivadabiruzudojida.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/871948fba3421606cc79632c483119a7/51401031692.pdf
    • https://xebecdesign.com/xebec/userfiles/file/47143115833.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+british+meaning
    • 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_off0001481c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1481C 16792 bytes
font_01_sfnt_off0001602e.bin
d235faa0bf1a0db249ca3e4eebee46ab19a829cfef5ceee53efc0c4d773a0eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1602E 22000 bytes
font_02_sfnt_off000198b5.bin
7155a47ea8acd1166a966472e8a1fc0693869b1cbc0af76ca751b1f4f83164ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x198B5 10492 bytes
font_03_sfnt_off0001b05f.bin
0de48d09b0091e2dcca1524f119562a2650f4f0070c1ddb91a42211a810a88bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B05F 16160 bytes

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