Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d803c9526a77821…

MALICIOUS

PDF

87.2 KB Created: 2021-10-21 16:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ce434987848a0b0e37defdbb60c953a1 SHA-1: 74a067124ba2db956f7ab4aef4ded584598cac21 SHA-256: 3d803c9526a778215894a93c66fd343e18e3bd780d50dd4d979235b9537cf35b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised or disposable domains, likely to facilitate the download of further malicious content. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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 http://dakov.hu/_user/file/56431940456.pdf In PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/topukuxerumefavelot.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/35494344653.pdfIn PDF document text
    • https://llc-sahara.com/site/files/gevageviziki.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/pamawuwimusufesubaxojizux.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/22116371309.pdfIn PDF document text
    • https://cowik.pl/upload/14473344359.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/vekoz.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16137e6e2d5503---muwivutizazoz.pdfIn PDF document text
    • https://airxps.com/userfiles/files/50326922279.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/xufasuxamovo.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/40590970150.pdfIn PDF document text
    • http://olympusflights.com/files/files/zirupitoxulejina.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2ea09a1d7---63270221290.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/85203452378.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/31049889483.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/70743854012.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/85385039458.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/86395980778.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1616c202a33d88---48031692255.pdfIn PDF document text
    • http://dogable.de/userfiles/file/sabotupu.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/64281b3e73087158e8e0d3919e4a0649/18860625359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RC0zOYPQW8A/uplcv?utm_term=calculate+mean+densityPDF 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_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 10556 bytes
SHA-256: 0188b567f96ae67c038c6f2afd188dfb8b234666904930ddeee3bf23fe641004
font_01_sfnt_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 19004 bytes
SHA-256: 75edfbf828a9a05b1682f7f171b2356b8eb7054cc8b3b143d05ac7ee4aa7d509

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