Malicious PDF — malware analysis report

Static analysis result for SHA-256 84da2e654f6d9420…

MALICIOUS

PDF

87.2 KB Created: 2021-07-17 02:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 76503c729f07d6d0b59dccc28d9702e4 SHA-1: dbf4756ab4e32435d35e415d379db583057dea27 SHA-256: 84da2e654f6d9420a5b8b61dd6419cbce8bf412ea10db4aefd32ff1274a7e781
104 Risk Score

Malware Insights

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

The sample is identified as malicious by an ML classifier and exhibits characteristics of a link farm. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or other potentially untrusted hosting. The 'SE_URGENCY_LURE' heuristic suggests a deceptive intent, though the document body itself is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://strahovka66.ru/userfiles/file/leligajufogaselo.pdf In PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/vovogimasafigusali.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4b28e008676717b01671e58bd1debcf9/49025455464.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/iuoj5slfv4m9jekic6mmobbss1/29436532075.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/35842627993.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/26d9741e6d214d9dfce32ede869b47c5/28793012747.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/49009610952.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/lapazowemewazovom.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/birovefuga.pdfIn PDF document text
    • https://susta.vn/userfiles/file/dimekaxasaveduludegikoj.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c908471312---37775125230.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/58139669886.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e32c660c97---fimumatadulebigobosudix.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/rasoxetujanudowagag.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/lixexufebifafelaxu.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/tafovemesojasugarevo.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/55802025127.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a50373cf---48542259239.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/dddlmbgalnrfksqa826l1hmt4o/29868408239.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/89446628759.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/84rt0ghajqhudr5e1rvt87t566/xolosofuf.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36d2b6b7c9---gixefomaruvibivifatobanej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=term+time+dates+2021PDF 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_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 17488 bytes
SHA-256: 86984f294a75a2ef595fc3192bb3b2de17a85d07f616595860b44833be348874
font_01_sfnt_off0001202f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202F 10396 bytes
SHA-256: 3a8857e1c05b2dfa5eb27c3a28805a1f6e34f4a9166ca1fc4fb3748943de18cb
font_02_sfnt_off000137de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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