Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca4475ce42ee522…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 08:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 767c753c3733ef94e4bb10916a7ee5b0 SHA-1: daa5f5ac4da70a928ff14f91371254c06f9fad45 SHA-256: 8ca4475ce42ee5221094b337ce5a02363e03a8c92c64005eaba5908f20d6e5d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16132d46226a79---nupuperekolojavag.pdf In PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16141b7b20beb3---gixosejikokuxedovozopasu.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/varibijigot.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/gozebarigezujizukenolaf.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/48892898507.pdfIn PDF document text
    • http://boldogelet.hu/media/28361625724.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/95301841675.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/26255586567.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ade69c38e---92479957469.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/zomotomufefurelesufid.pdfIn PDF document text
    • http://snft.ro/media/file/41902564925.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mudejitakebepapixu.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/guluzarapewa.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/95654403144.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/xejategidibixuxaviraw.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/34029820114.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/zidizukodurofezagilukup.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6142d1b029b41.pdfIn PDF document text
    • http://northcity.rs/slike/files/1355974063.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/6fae119adc9972800ad5c7bdbfb2b16e/41202253852.pdfIn PDF document text
    • http://jljemc.com/upload/files/97148360450.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/51396575829.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/85764824702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=apk+edit+video+no+watermarkPDF link annotation
    • 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_off0000c66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 17100 bytes
SHA-256: 6c485c70310508fbb0a076408ae44e8a73a39e45c7314193e976dfb7bfc29f04
font_02_sfnt_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 10564 bytes
SHA-256: 070a4ae2384efa890ddbb5c24dc26c8e60c51f5741b7ebf874ee2ed9ed0ec5e5

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