Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7cf3dc198c5c2a5…

MALICIOUS

PDF

68.8 KB Created: 2021-09-13 17:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4c61526aa1b29ac5dcac555f609716c SHA-1: d1d1a8e9b96e8f03cddc86ba5d3391bb5c227418 SHA-256: d7cf3dc198c5c2a53c5dcee1e82cfc06cf0f48d2795eabd920935e57b5ab482f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS upload directories. The presence of 'utm_term_redirector=True' suggests a potential SEO manipulation or phishing lure to drive traffic to these unknown PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://yesilderecine.com/admin/editor_resim/file/xuliwerifupunujos.pdf In PDF document text
    • http://acevina.com/webroot/img/files/golusimudimuvokowofe.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/zutoguter.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/tavuv.pdfIn PDF document text
    • http://soc-in.com/data/media/files/jabiruv.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/99613641380.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/fasudomegugumukafageg.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b953e0d2b5879b77adbc146f40baacf6/futosarejuxiranifujim.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/xital.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/22805759911.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/70386536562.pdfIn PDF document text
    • https://melz-feu.ru/upload/48463721098.pdfIn PDF document text
    • http://surtek.biz/image/files/20150319_042656.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/dexipokoxigevametidagek.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/bizamaxinuxajovibunifegu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t8cr2okmgs6s1lfdd25802nad7/47444760456.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7134a33a---92179672337.pdfIn PDF document text
    • http://mousike.it/img_ins/files/13327612301.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/37118976441.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9948216f---rixita.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/jigomakefasad.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/34581756224.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/36975932925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=in+my+opinion+i+thinkPDF 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_off0000b1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A6 15236 bytes
SHA-256: 0142331a41aa43963411ea3c16cb4459279a455d879298a8d7572ff00ddee997
font_01_sfnt_off0000d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD774 10068 bytes
SHA-256: 1f71cb13f52870f8c9b1189b7ef2ce6509f4dceaf181969fc69be0abbaf026c0
font_02_sfnt_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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