Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e56e663fd987e9d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-05 08:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6a7abef4356e509b688217ff0671a9c SHA-1: f153170b83d2e8cb34c82258d88cf00891b0089f SHA-256: 5e56e663fd987e9d60178ba3fbe9aa8aa28ccf1739515c61565ce9d2bbc06e1d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://garglob.ru/uplcv?utm_term=reducing+poverty+pdf PDF link annotation
    • http://hkt-optics.com/hkt/images/userfiles/file/bulokujufofigunajemavup.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f782ba88736---tipenidodiselubufipexemat.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607781b53bb56---35608414004.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/8489624452.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/xiwapapevurojutilem.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/54841491868.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/32802636620.pdfIn PDF document text
    • https://preciseenergygroup.com/media/menapefidusukalodasikeni.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/xatofurisipirafujorodil.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/xukerot.pdfIn PDF document text
    • http://gibisch.com/files/files/176669776.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701f16e17e7---sobidolizusoxonedujidoge.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/p7s0kgfcigq1g7klpk339jjp0r/todanebonudutiku.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vr6g7emhmmeu9ot686pbdphhu4/70557549488.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f479171e93---89182229023.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/0jev8kbkp7rd5g34bus7iv5491/34149664553.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/ninikoxaxivoridufomomejor.pdfIn PDF document text
    • https://akemi.ro/hirek/file/jowuresufumasazafosader.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fda07569e1---zoporok.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/13010112394.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2afcb139674adb40622394e1e0b6a26f/vobufotizufutem.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/74245208672.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/33273360678.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/20451375181.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_off0000c5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 10744 bytes
SHA-256: 93fb8f00d982f7367df977a783c3e04e00ebffb847d5434ead24cee33937e784
font_02_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 16600 bytes
SHA-256: d1a3d7f935592522d3a80ef40db8f877547c7afd213b143fc79ab4261ee99ba2