Malicious PDF — malware analysis report

Static analysis result for SHA-256 650650853ca0375e…

MALICIOUS

PDF

107.4 KB Created: 2021-07-28 06:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e4f66a6437131b955d7a2b30d88c43e SHA-1: 4706718fe62b36ed4f5891dd13d8e4d34ff9e120 SHA-256: 650650853ca0375e6a91dfc6f86a32f27ff5de708f00ec68d251f94d0a66b0d1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

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://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16082acad6a2ff---zafopox.pdf
    • http://bezagsecurity.cz/userfiles/68084151510.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/28005158261.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4f977d81b5f5f9d2c691780e43affc9e/44500605690.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a4faaa62---fuvaxig.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/bbe5ca1d1d99e64da53385aabb9df0eb/dopizorigatuwo.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/10736964622.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3718f491d49d847bc3c306975fbccaa0/90800575274.pdf
    • https://zivotzaokny.eu/res/file/fovomusebima.pdf
    • http://bafiti.com/sklep/userfiles/file/bemukovuvimudux.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/k18r4vl4o69usscjtrd1kr38b0/tavevopezazofe.pdf
    • https://groupburuemas2.com/contents//files/62864710202.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/10431012550.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e7a3d72dd---motirej.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/boxitovepaliwej.pdf
    • http://arcos-eff.it/userfiles/files/berupozine.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/2292770995.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/2d06524bbf7e9c0818703285661732d3/38047937677.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ade2cf7631c---rovimiwuginegububiwa.pdf
    • https://al-farh-iq.com/upload/userfiles/file/12518568668.pdf
    • http://dorrstrechy.cz/UserFiles/File/97796184773.pdf
    • http://swaminarayangm.org/userfiles/file/ripufiridaf.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072e12ae38ad---vivifudinenilipes.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/bb482d850bec90089e672f22440d4367/8666622868.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ea3a64eb1---lonami.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb43d000649---2358775731.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=libro+yoga+para+todos+indra+devi+pdf
    • 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_off00013904.bin
08e7837d163930e1af7f7668870c2bfd22607a37474b09bebf6fcd2dd97dfa7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13904 10904 bytes
font_01_sfnt_off00015208.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15208 16792 bytes
font_02_sfnt_off00016a1a.bin
1e8f19ba9b0d4cc2e3dda7aafc29b9d8c530b425171a05d886774a13a9bb0165
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A1A 21540 bytes