Malicious PDF — malware analysis report

Static analysis result for SHA-256 252dc1757c027282…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 15:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7dc32a187ead92c77a7d2371db3ee19 SHA-1: fcb3864779ad099ba52ab64cd7c65009f26b8229 SHA-256: 252dc1757c027282ea63d25cb03217a7b77290eab102ae3a245d4a2915614a7c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=j+1+visa+interview+questions+and+answers PDF link annotation
    • https://hondaotohaiphong.vn/upload/files/zeziziturujoje.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2dc9b1d73437e28c7e4ba664f23fa9f9/81659721583.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/81300367156.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c8d88587f48b3f7639a0347c9157c0fa/rototidofojawokewi.pdfIn PDF document text
    • http://santabruna.cl/upload/file/gulegibutapevikerarepe.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981b61c9996---70446525170.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6c463cfa4---7790260790.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/9972de21457cb3efad84e69c190886b7/salugu.pdfIn PDF document text
    • http://sparkpro.lv/content/file/80084878748.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/nowodukosafavuvesovatop.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/648b810616451008af4a30653d437f1f/mifipufilesonaka.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/69618392700.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/84344919413.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/xolaw.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5530a33df0---45200799594.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/21442953087.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096587dd73d8---fokuwumariganuto.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/manikojodozadonuz.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/98231700804.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/zivuraba.pdfIn PDF document text
    • http://toonesk.com/upload/94935541302.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f17eaa1f33a---gipezenogevujivil.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9eb12aa5---fopezufis.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/40802968058.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/47472953.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_off0000df64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 17452 bytes
SHA-256: aef026902e2e17a4592c049c0c88d4a95134ce991ae39207a03ef5e1e6117617
font_01_sfnt_off00010c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12492 10636 bytes
SHA-256: 6aced518c2720710c35e4356af9a7ebc77ddb8a5f3d2623670b2525c2c6b063d

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