Malicious PDF — malware analysis report

Static analysis result for SHA-256 9948f69f14661385…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 04:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4cdff28ae379c80c161312b04bc7e723 SHA-1: 78086776d6556ba57719104c59765e464ca41c93 SHA-256: 9948f69f14661385b334ce624a6cdee06fde41ba5eb943507535dd0e99224e2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. Heuristics indicate a link farm and a compromised CMS upload, along with a ML classifier flagging it as malicious. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://synerhu.ru/uplcv?utm_term=videomate+for+android PDF link annotation
    • http://gediklimakinahidrolik.com/resimler/files/vajiwavos.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/gibufegaruso.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/xejojiwomibutonaxiwefak.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/diripuniwixivujezaxo.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/rixarejup.pdfIn PDF document text
    • https://trystsalonri.com/images/file/68620932835.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/denuka.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/mugazibisuw.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/26076685589.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/fc9d6906f87d9848fb330f15b2038a88/26584198294.pdfIn PDF document text
    • https://majubesar.org/contents/files/jotuwileruxaletunare.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/60342855315.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/57469194250.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/dawepanida.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/32116991805.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/4481842379.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/79c17c560b9eee7f9af42f6cc9b0d04b/gufevarisizegutek.pdfIn PDF document text
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/vujujomizunuxevikidometop.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/94678078079.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304d4c02dbb---77086746348.pdfIn PDF document text
    • http://exim5.hu/_user/file/56589112676.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/kefizalebaturodirewemonu.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a6d8c79e---15972403869.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/xirig.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_off0000ba39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA39 17756 bytes
SHA-256: 682e666b4056e5e22d2850a3dd85239d4bac7b0a4a2ded6fec65e78fa5d95f66
font_01_sfnt_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 10268 bytes
SHA-256: a2493f6075f4ca5bca10189c2637a24a3ed97a70ff43d6de9cb3e82c7f26cd6d

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