Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c965fb671fbcfd8…

MALICIOUS

PDF

81.9 KB Created: 2021-08-20 04:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75e3732ee75016c38ddb49631337dbdd SHA-1: 362743b0471a2b02df36de54bb71cb1b1807f1f3 SHA-256: 9c965fb671fbcfd831191f80dc3dc6bd1b2f652ff4f04a86e8f5029f22bb8d8e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous distinct hosts, many of which are compromised WordPress upload directories. The embedded URLs and the document's structure suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b4c18be18---zekagoxizisuxelakevano.pdf In PDF document text
    • https://nhahangphongcanh.com/uploads/files/weragur.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/18122683435.pdfIn PDF document text
    • http://cooleywestbrook.com/clients/865832/File/jixovexesunemamelor.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/12510767114.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e11154e8b---bamojaloveverukogoxiderif.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0e66d0a0d---xosox.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b5df2b384---55791861383.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1c81ac7db---zelegenuvogenedoxivu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5biq7v9j87fhnt8fdo9dlt6d14/saxixineluwuxijuveme.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/40148005161.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afd90ea9d68---dopuzavaxuneler.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/69250026241.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/tiwukemexomezerele.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790e05823dc---wepepi.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/15582882542.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3ea36c903---norek.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33e83833f0---sibulinor.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/2951291895.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/16aa9f8ba8cf2d2adccf6e0366fc0def/kevajaz.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160834f4056b1f---lazekejasi.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9676989d50---pudawurixewetutifesovora.pdfIn PDF document text
    • http://chpcentre.com/files/file/vokijeseduzitezexixir.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ij3g8f7ekgqscmfuc6gsdqbh24/lisukawava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+dilate+by+a+scale+factor+of+5PDF 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_off0000d921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 17012 bytes
SHA-256: 64f07e053392d6b1185c2d2f2cc36be7e2bdc25c5bd2490022bfce0496f7f54b
font_02_sfnt_off00011ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 10928 bytes
SHA-256: 79743571e9dbfd706512fa35d8b6d39228da1d49a2ca8fae47de2ab0282975f6

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