Malicious PDF — malware analysis report

Static analysis result for SHA-256 043267ac3f4c42e7…

MALICIOUS

PDF

86.4 KB Created: 2021-07-25 20:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 185f5c45fda732b21af1efac772ca429 SHA-1: 669828d1dc8ad60044c25fa845958b1a476e8691 SHA-256: 043267ac3f4c42e7dbde26e8322385af558f30eee5ed4747ce086fdc538b51d4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The presence of external URI links and the nature of the hosting indicate a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ildiko-szepsegszalon.hu/userfiles/file/bugozalagudefadiju.pdf In PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/dabubupaxiguwesigeza.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81b2dd8cc7---97946031198.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609131af7b5f0---nodobuwaxore.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/93906121698.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/fuwajiledovofe.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad32880f3ca---11842650384.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/sepejowovunerorome.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/livivuboxolarolomasaxudim.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210630085300.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/paxeratezovijifepik.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0992c2c07cad5067feed3831a6632556/87823233560.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d067efca96e---filamonimibakan.pdfIn PDF document text
    • http://traviet36.com/upload/files/85043859337.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bibevaputedijor.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bfdae1220---falagedorosekutafusiwepo.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/46049902957.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4b0425204b4fe16e779b880537e88f86/bolonufafugelisijalatow.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/deed120de1744de1c5aacad94f43dd97/9273077251.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/48448000626.pdfIn PDF document text
    • https://press-centr.com/images/file/wikufibete.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/t99pgjg01io65v3qtlcv5d74g5/nuwevegatimujazij.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/3643493137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=clash+royale+for+windows+10PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 10760 bytes
SHA-256: 8000ca27699f240ac70a9f797a3dda967dde7bbc3028ac3da68fd72f2f0ac1a0
font_01_sfnt_off0001066d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 16860 bytes
SHA-256: 180011d1c04a79e604d525bdafbb2ed54f5b65ad7b03021b909e98841d405625
font_02_sfnt_off00013209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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