Malicious PDF — malware analysis report

Static analysis result for SHA-256 54efbacb691c00e8…

MALICIOUS

PDF

90.2 KB Created: 2021-07-13 23:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 821de67dba8477f427b3759349b10333 SHA-1: 8f227872417b6693df5944d7984cbcaaf510628b SHA-256: 54efbacb691c00e825f44baf2c4038474d58817117d12b9b3c7bdffc4fb9edac
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress uploads and disposable domains, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. The document's structure and the presence of multiple external links indicate a deliberate effort to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=epilepsy+and+anaesthesia PDF link annotation
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/87110159864.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/95755941187.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/53419163405.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///fepusomozego.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3d1f6cdbv4sb199u29rpji1s96/52454230732.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823044dfea7---81940486234.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//60256663779.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33ee09f298---87435419431.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9pa3c13515grs7tvoc4smoosgc/19441094912.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/95464567542.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160831b26c7022---98311158643.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d76407999---xijev.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/8957372242.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/gebarobolorumafexajimaj.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/63135966080.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ec1d302a6---siresoburararemow.pdfIn PDF document text
    • http://orlickachata.cz/files/files/favifomejixaniv.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/lu9epmo2160e1t5ab81m9d4776/dorarobivogufejewujuserer.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbde159d823---76363953731.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e50344dfe8---39484635174.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/levapuzudebiragu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a99e92f7babcc4f6c99ed30c837e2dad/65914974384.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c7433101---tikujoduvivonokame.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/739873b5b6be605515e8108544f69cae/votedijunusakopopunu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 10368 bytes
SHA-256: 4fe650f41db58ecc40bafc7aca33e2fdb4dbd816c79b8151c25c3609735566b8
font_01_sfnt_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 17772 bytes
SHA-256: b559d16aa5f4dcdd6ce3eaf8d64c91c8b935ffd8c9a13d43e806371e3112a47f
font_02_sfnt_off000144ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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