Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb40dda5a14f7f8…

MALICIOUS

PDF

92.2 KB Created: 2021-06-26 17:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4420e8cceb59b5f7a0a67d02b9048ddb SHA-1: e9292d28a8310ace0d7f02365a29919ee43478d5 SHA-256: 9bb40dda5a14f7f88f32bc2ceefb8f1b45c259cbabe8e7e06e3ca64f66d7726a
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to lure users to malicious content. The presence of external URIs and link farm characteristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be9bb5ce7---lisokubude.pdf
    • http://dawahcity.com/userfiles/file/gexanu.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d886f65f9e---salofexotatozelagiz.pdf
    • http://domholidays.com/userfiles/file/tifonesimokimukuxobakajul.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160adbf1d38bd4---vekilarakepo.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/516f679tfu37uu2ou83lmgdkk1/93839196751.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8d051e969---joxijan.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097abddf0585---30212734301.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160863ca8868fd---datikubidenisujixetimaj.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/as33fpa64iudjthbra8s3tlpd3/69456453807.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/idpov7fha9vh0gc53unnhadcpe/bedolewew.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7f09b467bd94c778640146e5081df42a/85694654538.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b9dnncem1pe7rac52flt3qon0/tisozini.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ce0523ecc---nefijinuzixerorumero.pdf
    • http://worldcar.jp/userfiles/files/74912012023.pdf
    • https://ludifrance.fr/userfiles/file/2543712886.pdf
    • http://camel-republic.com/media/userfiles/files/79922775392.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4fe3a7ce6fc411b24d7c75f2fcde73b3/49424863932.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/529lr5d01ui1db66ienhcumlps/nexob.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/22487215265.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c1be5366f84eb4d18eeeb44dc49b27f5/50791637858.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2b5b6a8eaaa0ced4350ecc7b3a55c3fe/13051172921.pdf
    • http://abogarestudio.com/userfiles/file/bewegatigasodo.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a80cfb64---4579255689.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=clean+funny+memes
    • 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_off000103de.bin
a9717709b83076d9fb3e54bc81ce6a00483c76897f12c36dbce1288bd17f1e1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 10212 bytes
font_01_sfnt_off00011ac7.bin
666e56f410b2095abec5fb64556e840368eee6f4496c1048157d19d42d3a1faa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC7 18200 bytes
font_02_sfnt_off00014a10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A10 16792 bytes

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