Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64334e87a4c11bf…

MALICIOUS

PDF

73.0 KB Created: 2021-06-28 21:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4d1707aaa6bcf7cd6c394b8057e0aeee SHA-1: 7001b4cc4fe537b475f6d14b9edd74f7a8b83bf5 SHA-256: a64334e87a4c11bf70f0d5a497e56255bff9eb0e87fc1d65357c9dcb5ef101b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO-based lure to drive traffic to these sites, which likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=how+to+add+a+link+to+pdf PDF link annotation
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b78b2baeb2---zonisusumarepeta.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/593d01dd4a351656f3f63afb28c3d74b/72484599284.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52fbe3010---pinelosuxajud.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/tepuduloxulolop.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160734aa652784---6285854863.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c7f3a592db9de0102a6409f5a55129f0/864196648.pdfIn PDF document text
    • http://praguetransfer.com/files/file/lulofivibetedininapufet.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/79e7a547d58e3c2d6d1714779bf1a207/30489639750.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad9d3cc33---14261910241.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ae5bm81k76i4ld67orulkvcpl4/zesugupoma.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/erp9r28entjmdu5uj24a5fjslc/35910303282.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/42317293759.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1356d16a2---gewafufide.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9bc6bc2df---nopamirobe.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/cti7qi0e1ids5rrerk4oe0b2va/nefuxitaxab.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/redofuxa.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/65538794129.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/31023848434.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa40b3b537---30673013819.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/25ed0a01c6dbec842a9e3d44d03de157/73215074640.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_off0000bef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 10260 bytes
SHA-256: e2e6350536c6cb07e273669463681b2379bcff31ef4aacc72be6744f5e6b954e
font_02_sfnt_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 15920 bytes
SHA-256: f4df298f6b01139c99751c60be9449ef528145100f710b66a13bb2635319a76b

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