Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddef49f5e4cb7450…

MALICIOUS

PDF

91.2 KB Created: 2021-07-03 05:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 96a0843f2809bb8225a9e78e10f5ab34 SHA-1: 2da03212f6bc3065e07f320af733ccd8457e90af SHA-256: ddef49f5e4cb74506c581b17307938e076590a81d069b6d9912b7d56edc77c4a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous links, many pointing to WordPress sites utilizing form plugins for file uploads, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure users to external malicious resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://queure.ru/uplcv?utm_term=the+main+source+of+water+pollution+is PDF link annotation
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/2jq9icro4lk362nf9dp2e1tt23/7034174201.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ea5408974---47384711386.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/nifepa.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9c82d224a---nejirox.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/b8b8db95a8009160eed2f60a0ab33795/gexewixepokotov.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/80e8cad5aa3517e6cf31922fade8cb52/26034126807.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6491c8690f---zowudiforonuf.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/9a0b10389c7f2b1ffaa92e400dfc1e49/14665771531.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/69515194835.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/gosabudujaforisepejotodav.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/40880085452.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9fb6c3841---divegarepagulolekize.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f9f77d035---wofazovogobo.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/tevilukejapugufonote.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/6014e72668bbf953217a54955f53408d/venaxasafukovekaxu.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/gulimuxalen.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/4484543540.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b462c49e52d---18585306048.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/996631e0a25635f079ed135cbcf69a2e/78059702610.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8243f3305---65290276997.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb67271cf1---99228525968.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aed1ebaef---neralejif.pdfIn PDF document text
    • https://medlineplus.gov/waterpollution.htmlIn 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://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_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F77 10892 bytes
SHA-256: a8ac659d6287cca29269b0bb6bfba97a993720676416502c0924d82650f9aa0d
font_02_sfnt_off0001388b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388B 17520 bytes
SHA-256: 1ddb685517c14438c2f2da95f68b6a40340d672a2a55a3d6e3095e1f95226887

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