Malicious PDF — malware analysis report

Static analysis result for SHA-256 5510e231ffc994ed…

MALICIOUS

PDF

86.0 KB Created: 2021-06-25 20:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5d4d96b36417728380d44df8e776463f SHA-1: 71ee621a358c6e9e15efd55005d8861d38b32b84 SHA-256: 5510e231ffc994ede6111e2e69c3b6c5a24143c4db111ffd8ef576f68bbf9166
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple external URIs and a link farm heuristic indicates a strong intent to redirect the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=brucellosis+in+goats+symptoms PDF link annotation
    • http://appletechsolutions.com/userfiles/file/filine.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/vaxupewisadobafolas.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/vibiwuzevuzivelakifinubo.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/09ba279a04f43df17e786f9d5e19b549/23505666661.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/21493576184.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160730fe508d01---wewepuxasolemevomola.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/28310215020.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d0ad55914---relapikepogotiguga.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080447a89e84---vegugixobafemavejidadis.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/37608375744.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/55946814681.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74d427e783---mafitipemola.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160821fa4d7444---wubokokozadigadan.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/2691586409.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/42pi7e00h7sp2ogvljsusahdnf/14123293234.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/n0edhavre4jo6h4evqd80ad1f6/41210301233.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f0284773321801626e7cd6db0e734c4b/tudubakiwifumo.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/4052712555.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/12134439785.pdfIn PDF document text
    • https://polandpools.com/contents//files/14934289926.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096028abc453---melesagogedoniviw.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160891f1222d66---texezasaludaj.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_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 17508 bytes
SHA-256: 9bb06da5d4d7d34ede585ba5e2da41993c90da33801ccc16bf4962cc9e60cfa6
font_01_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 10984 bytes
SHA-256: 121f64313bcd8a2bdd5ce455ca9fbc188bd9cbe15ca9adb81f29f962b5da7dbe
font_02_sfnt_off000132c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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