Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fce40016036e92…

MALICIOUS

PDF

84.5 KB Created: 2021-08-14 07:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: e62f2c38778e72cbe46b45dac994167a SHA-1: de3fe0209e92ff840dbfdd68430e2bb71812bbca SHA-256: f7fce40016036e923590401a0528f23cb2405710c085bc707896f049fede6cd5
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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 https://garglob.ru/uplcv?utm_term=personal+budget+sheet+printable PDF link annotation
    • https://dentalrud.com/userfiles/file/zunupizenon.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ad7640465860072072692fa1de5177fc/zetewurodulemuwisedi.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/vulamu.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/vuwegakuvoxakuro.pdfIn PDF document text
    • http://casaalu.com/luutru/files/velij.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/83738050234.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/21801255517.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/eb8aa831bc893612fa7022c6ddd22780/58672349379.pdfIn PDF document text
    • http://446888.top/userfiles/file/43760968013.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t6hk3cffa077racvt74g5hevd5/fepetibixuda.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/aks7m7ue61vfid8msl9hasj4p2/lipabebudefedepixaxi.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a382beb65---93952804872.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/93494478103.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b27aa7e52b9---10806319822.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/50348780326.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bbbc9ae3bd40a07447ec1e96b3625898/pubitolafopojenojexu.pdfIn PDF document text
    • http://chinazzjx.com/d/files/piwisewabore.pdfIn PDF document text
    • http://praguetransfer.com/files/file/vurateliw.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/39d08d46653258219d8b281f4c8144b6/telikug.pdfIn PDF document text
    • http://holzweiss.at/gakamulazevafat.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 10912 bytes
SHA-256: 548cb3a3a06494fecf01cc529e1a8104979348f9fffd777ccafc4eeaeb67717e
font_01_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 16988 bytes
SHA-256: df138f9daa5481586df3d7b91511d598842bbbcd8362f5a4328a994c64efc7f1
font_02_sfnt_off00012c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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