Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f81e72b4d1d196b…

MALICIOUS

PDF

87.6 KB Created: 2021-08-09 11:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df1a1d1ae75f5fc6a1b80f84a5ddacb1 SHA-1: 07fd0484956b78d0b0c22e10aa8a4b57233fbeeb SHA-256: 9f81e72b4d1d196b33b3d245f6f795d5a11e914c9f8f256919abac18e3b49de2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=is+the+sims+4+legacy+edition+free PDF link annotation
    • http://fotografieindex.nl/images/uploads/lowedodotimikafe.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/83231355931.pdfIn PDF document text
    • https://sca-kc.org/scauserfiles/files/72117510990.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/68411038756.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/686700192.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/nagowa.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608634b5c2a9a---18540951840.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/29578796351.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/154d5cbd9376af8706f78c61842f720c/47576519870.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb22c375b---nixej.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a706794c756---zeronapifuv.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/bf1caa4b58d0995e6fb27d40b0e6b14b/2798431868.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b88cdb94---bugej.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/21591787089.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/diliranale.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/e561be9dfe3ad2d5b72d385649b371e3/89516548401.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/lezanulakazab.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/10663295999.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bca01c9f3d5---zuvadofifitalurululedapas.pdfIn PDF document text
    • http://tipiland.net/upload/file/16118056666.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/81872290017.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/zojewikamomovirunetox.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/48245040437.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/416e7651ce401cd38d0384e97e3da3a6/95501064695.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_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 17540 bytes
SHA-256: 7b582923a3e471eab6cea31055728bf0859999c32cc9d6093e89b99a4e6139a2
font_01_sfnt_off00011eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C2 11068 bytes
SHA-256: 237627d32ea4a87180395a40780e7da6456641a17ed19af3e3cbe8309f98d8a3

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