Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d686651005f3d2e…

MALICIOUS

PDF

93.3 KB Created: 2021-09-03 07:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50905041711613b4ae61d39fa760e92b SHA-1: cf2e458e61450db30470088c2147be50efdf665d SHA-256: 5d686651005f3d2e88d1c5bc67dee6f11c4cb2e66d30eaf367ea5571153d867b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=regulation+of+blood+sugar+level+pdf PDF link annotation
    • https://blindnow.com/userfiles/file/xevak.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/fosasux.pdfIn PDF document text
    • https://seikico.net/img-tym/files/zogabukanadoxe.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/8399546629.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/buzebivenoxituvijuvof.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/88992583041.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/tuxawodimaretev.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0f7fd31b7---madesaw.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/36e2d0daad739eb57d77db17e533da3d/10671276276.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/6b2bf793b1637fb242ef99dc988cd360/21065750156.pdfIn PDF document text
    • http://chikatere.com/Upload/files/foxokevafepadow.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210822090910.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/56612910576.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/10460585722.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/a360dd4f4fdfd5dddc049474ffc7506a/notesuxata.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b66ea48ab9c---21514883948.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/dilotawawobibofobix.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/9821548632.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7a1e5dbcb---39897927414.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1ef16950c---goras.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/rawisawogixabigupetaf.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b748e36c314---10487684278.pdfIn PDF document text
    • https://aildf.in/userfiles/file/59475968447.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_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 11024 bytes
SHA-256: f1a94a6a63d53139ca60d53576a34fd8be7d98b4ab5210c57bb1ebd2b466ba67
font_01_sfnt_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE8 16720 bytes
SHA-256: 480c7c365c4ae7d4784ee7968ce500b4529ebc805843c683a9f399a84a7781eb

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