Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f516440a777d49b…

MALICIOUS

PDF

92.1 KB Created: 2021-09-03 19:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ba438fc59b6330d127d4c92ee315ebf SHA-1: f023eccd441fc2e68af925fb11fd4ef9e0242cdb SHA-256: 9f516440a777d49b991eb50e4ba7b836a34225929ccb1b4d20d797baeb4f5f94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm for SEO manipulation or to host malicious content. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were extracted, the presence of external links and the detection as a phishing trojan indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://huntic.ru/uplcv?utm_term=brief+formular+pdf PDF link annotation
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/nilukuf.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/luvaxopifibamizibox.pdfIn PDF document text
    • http://sam-global.ch/files/file/fidugadetov.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/60364013736.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e8223a40dfd3697370474823fdae399c/pogikuzaxefutoxojov.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0a97ab7b1---24675536574.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162474407152781565647.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad030835a0d---8461290049.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/76257417887.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/xulimebulepewivad.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/mosisez.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e60616a65e5---26286023976.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/fijapuzepabej.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c185887ec8---kejisonufibi.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1fec6a75b5613b809109ab010cd1745/narugo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e5b958c0---varonejoxovejibudow.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc8cb4f77---jetiva.pdfIn PDF document text
    • http://bptramptour.pl/files/file/58009520242.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160858fe200e46---sisapepa.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210829135204_e65f1s.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a37b748ddc---lefadawugokomefulariwise.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/928c123d42f2a47359e136cfc2591b72/65457600878.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/sasijizurimuropiwale.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/21948270813.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089e786d2fda---luzogelutolidulumesof.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/fab523907fae1dac631bf858ebe48b31/58314240262.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 10444 bytes
SHA-256: 40e20267d364c93d551053c0ca37467a92125b4090371c3e46602c27bbf03bda
font_01_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13234 18172 bytes
SHA-256: f00ba8a84c6bb694b693cd8a053d7149f75d859333b47206e934cb3f6e59b866

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