Malicious PDF — malware analysis report

Static analysis result for SHA-256 726873fed347d8c2…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 21:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9a75fc2d9e3e12b6c9f2c58fa7be10f SHA-1: 2c42c25dca584b2d260fc7f65a249631f0f620b6 SHA-256: 726873fed347d8c220d3c3387961366cf627e0755ddb086380cbfda3b03e2a91
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=heat+exchanger+piping+pdf PDF link annotation
    • http://interno-kazan.ru/upload/files/12434065878.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37385b30b9---59751662706.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe4947a2bf---solofik.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/jagusigufopuropanexu.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/v4ncvh0dgdmr8q81oordajht82/sebanogaridim.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dc4ec1456---61386131013.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/fc0d29baa413fc2b5173d0a6aa1baea9/maseb.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/5530318575.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/fa43297ae97fb2865a163f3055dd1823/fasanunifasubugatif.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2c5ec2a8984053338538715276ac5088/nokedipavu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86f47583d---61324044888.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/36988285706.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f74c772bb---wojakonezivel.pdfIn PDF document text
    • http://lasretamasapart.com/userfiles/file/85799978247.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1fc77f1361bc2108c23bf8ba6cfff61e/sawefawewomapo.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3733e889adbd9585df116e251c7da013/49122517502.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/f6fb896637838htp42aj65kc0j/68475002547.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/34112883158.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/sovivodoxizafa.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/26019851398.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/luperazigifof.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/19836713019.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3832d4890b---zadodixisema.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/53338599474.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_off0000d689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD689 17764 bytes
SHA-256: fab0f1f332ebfe45e1e8c847c8433dd3d1b1b875a939ff9f2229ea11672b9d03
font_01_sfnt_off00010488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 10660 bytes
SHA-256: 75819d0c1b6ad46f23fa8297fefa901329c1c6523120af0dd2db6d4306820e8a
font_02_sfnt_off00011ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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