Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5c6e33ea513152…

MALICIOUS

PDF

87.3 KB Created: 2021-07-16 14:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3e5e3568ffccc030363367619440525 SHA-1: 9225649c2a960d6adb131cad1bdac4a1c6336a60 SHA-256: 3b5c6e33ea513152aff326d3ceb26c1a274286fe4b49a434e6cc8f5488aec691
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF's structure and embedded links indicate it's likely part of a phishing campaign or a downloader for further malicious payloads.

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 http://comp-art.ru/userfiles/file/77375247996.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e72ea2ae63---kovepirogoxexaxixutop.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/wepapawujotojele.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb3df509cf---togixalovuwoki.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/xuwedexexid.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c54e6339a3---tigodifidumum.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607617d90f37a---vuzufezam.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/81577035616.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/12376370699.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/70593246469.pdfIn PDF document text
    • https://sy-tech.eu/file/62172056755.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/35959800459.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/mupetadodojezudatilok.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0be5bcdc7---ropigaxigadesedo.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/zubasemenaxofoline.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/figemozusupamax.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/otj5bk057p9eftr821ahko09ep/pekugaromotimebanipebol.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/6mve95frvnhgeuebbm4q5o5mc4/72677451691.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaeb55539f---73981413971.pdfIn PDF document text
    • https://go2germany.ru/files/file/3847584378.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/sotunubanekazomadetuk.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/63384085515.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fc636b150---zosarojofodovijole.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/lumamudijinekifosufo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/30nofclsj7c63dc63tukgan9hr/fuxuxoteva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=bitmap+after+effectsPDF 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_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 10424 bytes
SHA-256: a3f4825ebbfd491cf94f30d0eee1de645887d217ba3e050c70b239d2a71f794e
font_01_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 18900 bytes
SHA-256: dbd9496719a2d57ab76704614ceff8347657dcd2ad9c4d4f46196624f72a51fd
font_02_sfnt_off000137fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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