Malicious PDF — malware analysis report

Static analysis result for SHA-256 1131c4a666ea880c…

MALICIOUS

PDF

95.9 KB Created: 2021-07-17 15:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9d6797f8b63a06c16c95298ee453c66 SHA-1: 313a2a2da3f452ddb5147f786d6fef30fe1d5ba2 SHA-256: 1131c4a666ea880cd074fe30428abb46007709bef5a9e119e58e1fe25655a8d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics indicates a primary function of directing traffic to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://cabsfromheathrow.com/userfiles/file/73356106874.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae86aa860a---xatojoganowobekibutaf.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6ed2np0dhupqk589kk3j20aqv1/sipugegew.pdfIn PDF document text
    • http://ibb-online.ru/f/file/34236523306.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/8nj5gao250h7mftrpp165jpjd6/53578530986.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/48bcf820972030e602d9d2085c926176/65957771572.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/bivexolebo.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2266a9f8f2---wibukolesazoporenuzu.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/sajebido.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4d46e19e86f17aa7703498bae878b66a/70211968064.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29f7fae4c7---ririxedotu.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/8399bc97a3e7f5cdb28925a6dbc9dade/rebikadoke.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/duvezudakopimepis.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/83482473651.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/dudezoduf.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/72527114437.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/ditojogob.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/bazogeporok.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe4ab5ec83---48483175687.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/xeviveg.pdfIn PDF document text
    • https://x-software.cz/data/file/62937591312.pdfIn PDF document text
    • http://gtshotel.it/images/file/37904247382.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/25393431545.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/1fab19c2f865949cf34a5d0d0ae87d04/8430237821.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/paxulemibokumuwuwekir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=rules+of+survival+apk+mod+unlimited+moneyPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 16592 bytes
SHA-256: 088a903f924e29b7b96abba7c4f46fb219b7eeee07d9fd1988e2a284eb8dafcb
font_01_sfnt_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 2812 bytes
SHA-256: a7806cd804abae6bc74a8ace1fc5c122041ba1579b3a0a1f303e3c0181a9c8ab
font_02_sfnt_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000119a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A4 26956 bytes
SHA-256: 52069e417376926f64e620a7664f25caf49744ff6d5531bd504280f64ea30910
font_04_sfnt_off00015709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15709 11076 bytes
SHA-256: 8b7e790335a8fe19dd0f2e052c424c1b251cc1bbfb0666f508930e0cf461d063

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