Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18f090a64246eac…

MALICIOUS

PDF

86.8 KB Created: 2021-09-06 07:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8cf4c44b483e4a0c1c9bba150e303db8 SHA-1: 39dce18f5451af723bd1c231d89068f79e546054 SHA-256: f18f090a64246eac64982e34529c7cec24025d6b498955391425eab2e8bf4f8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm on compromised websites. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=curriculum+vitae+europeo+pdf+da+compilare', likely serve as lures to download further malicious content, potentially exploiting the user's intent to find a curriculum vitae template. The presence of numerous links on compromised CMS uploads suggests an attempt to distribute malware through seemingly legitimate channels.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=curriculum+vitae+europeo+pdf+da+compilare PDF link annotation
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd09b1c2ee1---98535824272.pdfIn PDF document text
    • http://ashioke.com/images/library/File/21295557514.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/ae9551526eb6ac6caaa5fa9e737611fb/kuxedi.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/73799926413.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/49893546056.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/29722423479.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0f316dad39ce9d9d93d2e8d11f8617f6/43253532807.pdfIn PDF document text
    • http://santeh.md/img/files/12080464365.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4fe112710---91696935216.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3d10dec83---98947915580.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/fixidanelafatupogugeli.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/suxagamirevowepogirasib.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/49682023962.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/096dfef60c5065f2db80a960406296eb/nerob.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/37764384657.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51ac62a256---95335942108.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/xorakegorasozemisolol.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/79160701274.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/6548720338.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/73289906062.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/23687485783.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/vorakaxopexivizadud.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/maximazefut.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608134527f50d---13059891095.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_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 10704 bytes
SHA-256: d2d02b53abda2fe10f7adc338752d19c644cf38a2d6055d33e04bdb7579e26e4
font_01_sfnt_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 18152 bytes
SHA-256: 3b6bc723bc7c55dcdcfd76fcf66d9b855d86842d9bfa1577cf77ee27e3a614d0
font_02_sfnt_off0001353a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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