Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d81b8e6157a9dad…

MALICIOUS

PDF

77.3 KB Created: 2021-08-20 11:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6196e24a004c687b2c5302fe4ec65673 SHA-1: 7e0fc410f04eb3acb951a4bb0f1d4d117522e430 SHA-256: 2d81b8e6157a9dad70f6cd8f2f205d2626ea5f8394fe5f3ba6a8d068a4753729
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be directing users to external resources that likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f5fb96c54---petovosudakitevajivufefi.pdf In PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d94598204---sepururutepumaz.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/36954015222.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/fobir.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/75907564679.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/febubelati.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/369c43782ce5547adc4f87029fbe98b5/matolawitigigemajorapemur.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/76390783317.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc20adedc5---sidoxu.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/pakuxudo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a332f8b1b0---43505898369.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/53bd75da2c01362692fb0f3e51cf58e9/fesiliratixuwanemerupi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608fae5515dde---81295720838.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d198d87e11e---sagipotuvuwuwitemurot.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4764c826c---zijoda.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/kukeziroloriduzuwefexu.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90eec18a98---mubix.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/220595571.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91e76fa49---68314537304.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089cc3681fc9---zibubelo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/58256456ec4727a4ce7fd9ed6e6eb8ee/48028485908.pdfIn PDF document text
    • https://makenie.com/upload/files/97004448990.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/mimigupilofop.pdfIn PDF document text
    • http://didopack.com/files/migofajolufevatuzug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=star+wars+thrawn+ascendancy+chaos+rising+book+%28collector%27s+edition%29PDF 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_off0000c5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D8 11344 bytes
SHA-256: 46c88ed611414991cc231217cd9b0d655937836867c8af3df98d984bc4d1986c
font_01_sfnt_off0000e07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07D 17228 bytes
SHA-256: 4d9a0fcd51ee4ab46c8a81860794fa509f71ecb2e3777271d7f27a483d475f6a
font_02_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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