Malicious PDF — malware analysis report

Static analysis result for SHA-256 69bae9d76d6ff8b7…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 22:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9843c514d6f1fd353b4a98d89f3d172f SHA-1: ef4914de2d77c27c84f1a4551641ad217a4ba0db SHA-256: 69bae9d76d6ff8b70aecaa2645b34a4b99ac7fcae8dd141d49788d6b4e8d7995
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://huntic.ru/uplcv?utm_term=schneider+m580+plc+manual PDF link annotation
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/lsccv8ingaquurfskkaa5uapc3/34610807691.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b23992cb1---87270997565.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/25983339277.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/sodebinosopovonulipalav.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/96902837516.pdfIn PDF document text
    • https://hoavily.com/uploads/files/tizubirazunetesab.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1fbe79f94---zulaki.pdfIn PDF document text
    • http://ore-processing.ru/d/files/rubip.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/74903036715.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/vezujemepitan.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/zelikojasibunidivu.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/bunusavokakuvezebuto.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/dozosurumubiwogeludasigo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160712653ba651---tifarakitiguvabodi.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/30355049669.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160768c496216c---saropavusatimomotiful.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/kjvfk0v2sb96dq0i6msfdllie5/nudidujopifapesidiga.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/97832829947.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607217208589c---66016042050.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e857679314d---48580876942.pdfIn PDF document text
    • https://www.cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/serikiluvelarekefuf.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/viwiliwi.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_off0000bcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 17544 bytes
SHA-256: fc672eef750c2f2057b66d225cbc5559ce390295af7cd4fd418059b09b5da568
font_02_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 11032 bytes
SHA-256: fe07d7fac943ba910e77e4d23d4de96660c7cfcf7ec27e3170f44965c579313a
font_03_sfnt_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 16668 bytes
SHA-256: e598f1d9a84e41b3a4e0dd7836e5ac738342de69ab930d07c019297833b2106a

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