Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff5091c2e245c6c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-22 23:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f0a0abb17c8a0d79803604864d4e778 SHA-1: 6e3e721bf8aee6b3003e94cbfb7d7577098c0a54 SHA-256: aff5091c2e245c6c5c77dc43af4e159667b16aeb4c405b20ef0c971bc00e1f1c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. These URLs are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://ketchas.ru/uplcv?utm_term=vidmate+app+download+install+old+version+2019 PDF link annotation
    • http://testplanet.nl/uploads/files/31364927994.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/43679890548.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/didewawukel.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/nusabujozaxebiwog.pdfIn PDF document text
    • http://asja.ua/userfiles/file/60047060966.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16149923bd1d66---terumumefiwosudu.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/jolutadizareg.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210912170949380183.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbae836a6c---77797195510.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210908_013603.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/vakajogijat.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/12891493083.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/kusavosiwibomu.pdfIn PDF document text
    • http://aweibel.com/Photo/file/75914407784.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/dujegatipofawoxupa.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/vitalefusoruj.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/kiwikiwowebusezo.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/85988075752.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210920174550_26778247.pdfIn PDF document text
    • http://divelife.kz/files/file/jiremerul.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/70866264863.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/546d3f678b1a342ffb9605235ce013e5/82940816277.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/57305269365.pdfIn PDF document text
    • http://pedraferro.com/files/files/bopivarazojigugorulo.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/xesone.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ch0ua18msrkhgeqf96tiu3096o/30060301106.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/jazofixipalupo.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_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 11136 bytes
SHA-256: 486f48ad84e786b4ba46eaa0be0be82776bbe58b6cb1c66954c31fbb772c9e33
font_01_sfnt_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C27 18088 bytes
SHA-256: ccd5947d1873c3fb9c629ecc5259e3ce8f86ca94bd70f320bbbc3feca8d1bd54

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