Malicious PDF — malware analysis report

Static analysis result for SHA-256 882e8e4e4d1069c1…

MALICIOUS

PDF

73.3 KB Created: 2021-09-06 16:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 91d16847929206d0e4f4b64b686ec86b SHA-1: 72900a35b6e89bf3933d94f97f759c500838ee22 SHA-256: 882e8e4e4d1069c1f4c168646a3a71a8597502dedfb3d8424b22a78368fdb1df
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a broad distribution or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/30916eb60b6b9072d10595f6ec4eab87/zolezonikibuzakuma.pdf In PDF document text
    • http://chupanhnoithat.vn/upload/files/96495182225.pdfIn PDF document text
    • https://ivaco.it/file/vegovagesorib.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/umv351ftlgfjm3u75sf2uskae3/64705328008.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/39321ba367384e17b3f39afbb6d7e6a4/68953508665.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160993ba6b599b---makemebozofakezosuda.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de3aa2ee47d334a993a4b1dc36e959ce/vewibuw.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/95587738966.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/tarukeririfulobirudikisi.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210824043729218.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/xoxosa.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/bigefovometufujifoju.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded68457dd---xojopebixemibidivagax.pdfIn PDF document text
    • https://brs.jo/userfiles/files/86332319128.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/73431433373e92f36413025ecd9233e1/73711202031.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab561d8c46---50577915263.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/0jgs59kj7baikfdostgsemcapo/81145368159.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/88h4rk8s5n5k2akreamhavclrn/44320571402.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/75786844888.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13ed5cf35b---muzalamajatim.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/31741162084.pdfIn PDF document text
    • https://digireg.nz/upload/fivalitalosasovifimuvo.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/numaguzefazone.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/19727797478.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/90685052121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tamil+jathagam+kattam+pdfPDF 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_off0000b557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB557 20160 bytes
SHA-256: 3dae9e5e1485d8d62617cc7e6269c16171623dc1eeaeaad117118c2972faffc8
font_01_sfnt_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 10504 bytes
SHA-256: 66e5af66468a0d80ab799f45b5df80a4f92f2e8ff64516e7583f214d4407400e
font_02_sfnt_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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