Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52e3d647ac0fdcd…

MALICIOUS

PDF

86.2 KB Created: 2021-07-07 01:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d70ed183511cd7b8695f8a3d40885ee5 SHA-1: 78fdd9fd9f75ba4d5dfd2d52fc832044634cb1d3 SHA-256: f52e3d647ac0fdcd93c46c7e82fa7d3d66a7b98609f769e91adbfcc062aa4389
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs and link farm patterns, indicating a likely attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, with the document likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://synerhu.ru/uplcv?utm_term=about+carl+rogers PDF link annotation
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074634c3e392---97891989966.pdfIn PDF document text
    • http://iccarrentals.com/files/file/67761240303.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16079df471c86d---mopelevodoxanotazuvumeb.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/60222034816.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/jexavugakedimimipupa.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/23853325279.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/95617297624.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4d613d1202d198915e015b7c0964297d/51465889114.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05e65d1910---75902997535.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/55437944086.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/wesefojupex.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/69209855028.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823929afaf9---47413046436.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ab996d77141084dc4f0341f20690667d/71406653254.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/579f46fa3c858b218250f464b67c5753/xetakebibajifafevogomox.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607618e558db1---16337110624.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jftld5kd98q44potc5vf8te1o5/56831087909.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/nodesibevobifudodikisuvi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/jobebesomusubizuwugif.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/kdjp05c1bs7e8m0oefkk9esmhb/89520560440.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216291715194909.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/29110621218.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090b8f393785---dogotumiriramebupajeto.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_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 16720 bytes
SHA-256: a505c602e43a4ac0b7076d67348cc23da5a375d8e20053c1495f9747a36861b1
font_01_sfnt_off00011c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0D 10432 bytes
SHA-256: cc43b98bca8934ddad31b7ce0a92e5e3a865cb6a32a1cc4080d1c907fd83a4ae
font_02_sfnt_off000133f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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