Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf4ef7dff037bdc…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 09:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 27d61d97f0bc30ed78797349ab15fa05 SHA-1: 43bf0568b2e64ec4b5f9480100d61772bcd4225f SHA-256: dbf4ef7dff037bdcb5ab1329f3c80d1a0f7df0395ce5f66596e9bcc2161e3faa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing sites or download further malicious content.

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://laborke.ru/uplcv?utm_term=reading+past+simple+and+past+continuous+pdf PDF link annotation
    • http://fiumevivo.it/userfiles/files/kolufakor.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/dajodizixovozurit.pdfIn PDF document text
    • https://badoza.net/userfiles/file/43113872777.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/rabefabebuxo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/a72208bf40ed22c6110ae5df50066977/xubowubupu.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/60780381134.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a28f37cb3---43909040265.pdfIn PDF document text
    • http://fitviewer.biz/files/file/17934656138.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/52195600863.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/67496258199.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bb1eeec1b---xixuguranadedurilev.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/butubabemetal.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4b3863498---buritudeposejumamurin.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/5cbd3113562b7feb7f7344cf05f6d229/2547796568.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/vovorev.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/t6lga1cbnh85hik9bensh7ctnb/26730874320.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/bb8ef4f1a9b3b18389612b8f50179d36/fijesusebamisabe.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/kubuf.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160f32283aeee3---zejoxoxeruwimuroxagizod.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d0e8aa765---79304889388.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/18839570470.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161090c0f3b727---rapusinafopakekilujovuson.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7u718kd6ka60plijhc5a2flar0/72474054465.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a108c5904fb---46492087664.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3e507782949121a8262e504937e1eb06/1056511202.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_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 11008 bytes
SHA-256: 2f6d8eb12d23c2e8f2e12583a615e306d29ed8c8987dff9db606210bb474b564
font_01_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001134b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134B 18800 bytes
SHA-256: 928b5bac70b3d88838118befdfcbe9dde20a640d86345c317275dfba1eadf8dc

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