Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc395e99f0c9cdfa…

MALICIOUS

PDF

97.2 KB Created: 2021-08-30 09:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9494d178ca49af878bc6dfef7aad13d SHA-1: 0034d82bb89b9c7e28e9b976f2e6f4f6e6ddf488 SHA-256: bc395e99f0c9cdfa92937a573abc8be675ffb59c6b5278374914c5cc65d1bebf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ceaba2a4f95---83085103061.pdf In PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/929d87ebfdc28520cc60610d1bb86da3/86710371127.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608046cc67f59---65936828664.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35d02b84cf---76077176680.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/89495483379.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/bl48vomoh659rshcli1laiqmea/79234122219.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/tudiwom.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/wugikidabugotak.pdfIn PDF document text
    • http://labsshop.com/d/files/3445919317.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a128ebc37---74168182896.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20f6dc808f---12947399296.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/83501344224.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f917d2ad246---gakiwejijirik.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/aacfaaba69ccd926eb9cae39aa5cd2d2/wolovolatelatidomet.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/funuzitutexazejegivi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609477aecb816---99640766968.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/32617488560.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/sesunupezuwefatixuwe.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/64445161867.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/zonulikirepivatiga.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/62489254725.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f37cb697fea40ff39d83c64295484cc/lofiridezozidinazirowoxaf.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/689848461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=normal+distribution+area+between+two+points+calculatorPDF link annotation
    • 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_off00011365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11365 10976 bytes
SHA-256: cef775a37b6a662264c9019a6478db20385f1b9f346ccf2f72c5a8105258652e
font_01_sfnt_off00012cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAE 18976 bytes
SHA-256: db4349deb68db21ac1db9c804e5343388570fd3063a47918942355dea314f34c
font_02_sfnt_off00015e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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