Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a3ba82ac2d793e…

MALICIOUS

PDF

74.3 KB Created: 2021-06-27 03:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 649ecaa2a6a395a88c4f2017c6966ba8 SHA-1: 6ef164319d66adfe9d0127cef3d04db5ef4b2aef SHA-256: f0a3ba82ac2d793e3ae5e958c368ca889891f632d64144a4d89afbe58f5d08eb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Numerous external URLs are embedded, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with a spearphishing attachment used to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=the+crucible+character+quiz PDF link annotation
    • http://keacg.com/upload/files/sumitojup.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f77315098d---jodaf.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/4d54732d95bf119c131739c1cbdde1fb/tejokutiz.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4kgdukdab5932kt45k3bmh13i0/wurokul.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/41481198598.pdfIn PDF document text
    • https://service-panev.com/userfiles/vepifupavol.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f4d91b16571838ab746c5441b6fbfcf3/59969640543.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/3022983830f054cf3945e8b695a69cd6/68203084085.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/banejebutidedatupafopuduf.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aac9fd6751e---kunefalim.pdfIn PDF document text
    • https://chp-travel.ir/data/file/78090837614.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a053caad765---daribugalojapoxu.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7b4295e53c70dd1f9c126ae7cbd402cd/14697766697.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/rijesejokikobifenera.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/941vdtb8me5mf799r6npseogu3/51539057284.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/4134706584.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/powekisosi.pdfIn PDF document text
    • https://agatanorek.com/files/file/34511168071.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/nimoxowip.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/34171660112.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/3d2b900cb04c9dc49762f4f89aea8d9b/82468997221.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090931d6c6f6---zavanukukegi.pdfIn PDF document text
    • http://artospace.com/pics/file/1512894015.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/43113498284.pdfIn PDF document text
    • http://93564497.com/userfiles/84778479919.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_off0000c009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 10344 bytes
SHA-256: ddd83753defb59324036c9bb4428918f058463df335d4155400d51b472b4b8e0
font_02_sfnt_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 16972 bytes
SHA-256: 7fba5460c1e301dc6f66e4d7a9e260e4083dec1187d0add088bc9a7f4350360c

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