Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d89380d6e20702…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 23:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 612177e5e5f4791e97839120e4228eef SHA-1: c053e10c76c075364f32a76c3dc5459b19349b6e SHA-256: 77d89380d6e2070285dc60fd93b7da7f1458dbc1ad1b4de53d12eb366405d7a0
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The primary attack vector is likely spearphishing attachment, leading to exploitation for client execution via the compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/l35in6crpnvoj0vv79i77e1kv3/lalejeraxiwima.pdf In PDF document text
    • http://cnc-soustruzeni.cz/files/file/kisimopogasisoda.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5c28d96fdb4530ecd7d1e2f686226b79/51712634375.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/tedojebakezalew.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/64677252559.pdfIn PDF document text
    • http://arslanemlak.come/file/xifugujulakamijene.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/82037343731.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ff466ea3db7a7df3c98da2cd5bcacda3/famibafuzazizedu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a7daa8b08d9---sonajadoles.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718f9dbc144---4333637405.pdfIn PDF document text
    • http://zkpower.net/upload/files/86968220175.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4rq8he7pbmp162llajfbeknfc1/gopimawomisimevotubileg.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/14706068229.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/rizanoxilogak.pdfIn PDF document text
    • http://novichiha.ru/pic/file/palijuk.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gapuwonavobawo.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/54176861552.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/45111067793.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/28850938404.pdfIn PDF document text
    • http://tidomusica.com/uploads//files/202108071031366136.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/gojumofifokirujip.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/46f411d8e6563a06bd1ce317005fa05f/lakufopigewekerak.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/14936762618.pdfIn PDF document text
    • https://begili.com/uploads/image/files/28263576098.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/73700599568.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/11448388582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=simply+supported+beam+load+calculationPDF 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_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 11104 bytes
SHA-256: de762223bbe655ff9c5cc8cb8fea5e4619cabcf5b7f593aaf86f73ab6db7348b
font_01_sfnt_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 16404 bytes
SHA-256: a138c34edc0c582db232fe1ff23aab46e8a4989055e6f9ffd92d75a5c532f730

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