Malicious PDF — malware analysis report

Static analysis result for SHA-256 635fb923b7be4fb1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 02:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6617d17fa1a98d70a0e3484195e28f2a SHA-1: 7528022491e49007882af1b8e30069398eec974a SHA-256: 635fb923b7be4fb1630d6d7fdf45320da200a3c3b6e95cb4b050e5c7d5e48546
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://dulwichtaxi.com/survey/userfiles/files/sogewajonor.pdf In PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b60fc8b74d---44888338133.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613be4fe53863---powipagufupusatowab.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/rebivomaredip.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/62986318030.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/tasifarawubenebodomuf.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/89667945535.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/63961549877.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/acc2b44e14a6648f101dbff34244934d/77576786499.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/monimupuvipex.pdfIn PDF document text
    • https://windsbs.biz/files/file/97751907493.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136864812ae5---rudorizis.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/roxejomeperibajeketodevi.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210907174943883.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/89286490757.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/20834721792.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/fuxamafelaxatal.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/34089679307.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dadimage.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210913045143.pdfIn PDF document text
    • http://greenglobepms.com/uploads/27935222398.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/safog.pdfIn PDF document text
    • https://value.ae/userfiles/file/7646716562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=my+hero+academia+season+4+episode+77+dubPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBC 17180 bytes
SHA-256: 4dcf46e695c0d7d48729c9e2c25e8b9869c93f72f2128d5a908356f28e1b68d5
font_01_sfnt_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 11112 bytes
SHA-256: f733bee445d2e9eaf39b5b8e12a4884528d39d6d6e75d06b44ef148209d75578
font_03_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 18416 bytes
SHA-256: 6028f7275834a842e6e8812f42209551c3381d5192c510416bbe7be04f0faa38

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