Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff820dff4a1b75db…

MALICIOUS

PDF

118.2 KB Created: 2021-06-26 07:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c05662ef54cd1e3dafacaa1c94a7649d SHA-1: f2ed643cffb7222092037002e7194e534b74b171 SHA-256: ff820dff4a1b75db0cba8c732a1db41cd84520f82cef6d50ff138a3a7da73035
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b35413b8---29949308131.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff6dafbfa---38051191171.pdf
    • http://duszek-lasu.pl/userfiles/file/bodaduwesefujenoxibigiri.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2fec56f90---56685146922.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2459e27e6---66904977195.pdf
    • http://poorclarescork.ie/images/watomokisam.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/9ad56fd7fc861d4afae71ead83b6ebf4/95826198784.pdf
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/ruxogin.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9vq0op0tagptuf8rk513egiq4n/14222589780.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c6f363715---65185911280.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/pl94e6ut82ml13v1o1pkmcm0s1/xadininobebeje.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d039dd7fc---26336604774.pdf
    • https://bikeid.net/ckfinder/userfiles/files/gurodudo.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5bbd4a6dd4942c4e2fef1bfcbc1c0cd9/lamojol.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/gad5g774ku6v6dhlqi8u5f27u3/nejafosewalerajimaliz.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ftd7njlcc1dhcp6tmup5hb6i05/8160655860.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083365aa8920---10158433549.pdf
    • https://gtnet-engine.com/ckfinder/userfiles/files/84133923012.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/aa34187c1597fa873603d5d57e5f95ed/zatakavelajejix.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/fudaxipemo.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075772023b7c---80663929597.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3294df49f45a6cc9b2655da8de33a0ee/15436647617.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c9be891ff---josenodesimafosojalife.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=universalism+theory+in+business+ethics
    • 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_off00016c23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C23 16792 bytes
font_01_sfnt_off0001843a.bin
a6eed0214e38cc6f5d1bddc6cedc52e7fb4a46b3951474f42617fcc6a09bd590		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1843A 10920 bytes
font_02_sfnt_off00019d65.bin
365557d78cfb92753813760a6f16efc64d4afdd533db0620e36b4764ac02f28b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19D65 17756 bytes

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