Malicious PDF — malware analysis report

Static analysis result for SHA-256 6935bc1209e7fe8e…

MALICIOUS

PDF

89.4 KB Created: 2021-09-05 01:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f01dcb49560655d703db0e9d6527a68 SHA-1: e1b0aee7c5ab1a784e2c027ca76ee94a4d4791fe SHA-256: 6935bc1209e7fe8ef15b1f7a4fb88c78338c579ffb5ace58e8c0910756d90d58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external PDF files hosted on potentially compromised websites. The presence of multiple PDF link farm heuristics suggests a deliberate attempt to obscure the true destination or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864e994e1b5---tugugusaresusekuvuvej.pdf In PDF document text
    • http://studiopol.com/userfiles/files/lururanuraxuzuj.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/nasorimibedituwiwar.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b3b92d1f4---11151495872.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/76208319652.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/fo8fu7u5qtre6gj8sdpkrhdmka/gedebalamudafifeko.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/98400414494.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210810154853.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/64018027509.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e17aec993b37b7a8dd591520433349c8/fatimaxo.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/kiketotuf.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/35617059192.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b72dae3897a---46652482809.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e81f8eb4e---dibusapetumam.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/dogibubabisuru.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/99436175217.pdfIn PDF document text
    • http://planbmedia.hu/files/tojavaluduvi.pdfIn PDF document text
    • http://jaatkinson.com/userimages/melubizini.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608115d98f5e1---lukanewit.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/9doql6q3in4dvrqf4fml60utas/60971943461.pdfIn PDF document text
    • https://tomas-music.com/contents/files/51897435795.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b48148fb8---xosevosovaj.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/jeduwej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=2016+buick+regal+repair+manualPDF 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_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 19660 bytes
SHA-256: 0e25c0cc3d4df096432fb0d08c6fb1e2a486c9553614098abee0e28716f185a1
font_01_sfnt_off000126b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED0 11028 bytes
SHA-256: 10722a0fbc1b5afcb19ad3a021fe88997330d72d897bf0ac97fd69932b730a96

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