Malicious PDF — malware analysis report

Static analysis result for SHA-256 d551ee26ae224f05…

MALICIOUS

PDF

97.0 KB Created: 2021-08-10 00:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf07b32d4420f529ffe4124baf715aa8 SHA-1: d063d2167fdf441f6386085445b6c3a48c75e2f5 SHA-256: d551ee26ae224f05f1ffa2a575468b68aa689e475b273991d2ef59c82394c8ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It employs SEO poisoning and link farm techniques, directing users to various compromised WordPress sites and disposable hosting domains. The embedded URLs suggest an attempt to lure users into downloading further malicious content, likely under the guise of a free course or resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=cours+excel+2020+pdf+gratuit+t%C3%A9l%C3%A9charger PDF link annotation
    • https://whiteplacard.com/UserFiles/file/51725112490.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b62607c31262e5f20e527d54627d5072/86506593037.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c11ec428cae---38863366454.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/gubese.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/26708109413.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/xinuzuf.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079c400eb73e---fenoselanilaxobufaziwi.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/bb4e7ef52a09eab498630abe0a43e906/11634430640.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cc0c73da---nujusegizadebugogoxexi.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/kaxefulunowepuru.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160864b9bec37c---pigarigoruwavavilugol.pdfIn PDF document text
    • http://citra.cl/userfiles/file/52961891696.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-14/20210614155306321419.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/98758884191.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607d80d947484---wobajoteje.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/46f90a65186fb73fb74fba6ec8f91285/28454514902.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/58336970343.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/vikenukukovidu.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/tuwifavevutojaf.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/jegebodoba.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc9c10515b---69768375220.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/20157914652.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b8f3ea5db---76539896220.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 11424 bytes
SHA-256: 751edb2d498f415ffc3f70a0c61cec6f02f6b456b9ddbfa6952336bec0ced8f6
font_02_sfnt_off00012986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 16664 bytes
SHA-256: 28cf435f8b16abe85a4bc1a1207479adb7893d6d485ccb0514cba46f335cdad3
font_03_sfnt_off00014057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14057 19824 bytes
SHA-256: fb3c286fc842beb9f281f6ec2db6520c1456740ab78140c66d2546ff26d5b33a

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