Malicious PDF — malware analysis report

Static analysis result for SHA-256 9212319fd16491a7…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 09:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84889f04c003882e7bde768adb6dba71 SHA-1: 33049998acc5b46a1fd8b2140792740e93665d18 SHA-256: 9212319fd16491a76c1879c4c3c3885ee2bf0b16e77c958ed50273c2f5985f33
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs suggest an attempt to lure victims to external malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=food+chain+worksheet+third+grade PDF link annotation
    • http://ototavandosemesi.com/resimler/file/63258047006.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a683594fe44---30256818690.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4eff137f5---31104758441.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc898b824d---67099289953.pdfIn PDF document text
    • https://bnovum.hu/downloads/58132918038.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/tavawogunapusovigepe.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997bdbd319a---32049894355.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/195d9fe67b1256d7ea949e51bf162352/lilirupedeloforam.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/17296531582.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161200eb957095---84538052377.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/61071136382.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/43311309640.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6af84480e9---72724998418.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/21372120189.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/kijivigizuvovezow.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/jiwapomenitebiba.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/zibanizejabawuge.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d6a75b79393288815b3da079509d7019/xajemodojinupowoma.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a846797e268---87867578092.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/1620872757083.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/dgtvpimp87h15s3tn4rkmou2bq/49016704884.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da86120dea---54590939064.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c209c4e39cb---wakugopevo.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_off0000c4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E9 10756 bytes
SHA-256: 09fc9e98826957a9a91052a1ad194dd1c469482779221d177c5d8561eb5041c3
font_01_sfnt_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 15560 bytes
SHA-256: e8c82d9d5ef5c2e8fddfac2e62b8fad1401dd967e8a3878ba2606d3a1e498503
font_02_sfnt_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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