Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0a961e3d1274a7…

MALICIOUS

PDF

92.2 KB Created: 2021-09-10 15:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7dca62c0505d136acce2523b2b434ac3 SHA-1: a608f061a86b8242b4b17cf054b51b51ee7b476a SHA-256: bb0a961e3d1274a78fab6674eb0be1a6e1a2fd5bb3724c4780e0b0a2ea0e0c23
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or raw IP addresses. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=how+to+create+slider+in+android PDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613506c7eed14---55814729061.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae1bb0fa6---9696582385.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/74804129813.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/koxazibilipe.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/22650362605.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210902063237.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/19152601717.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/jusevigiwemafajebun.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/muramebozewulurox.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/zivedasoragud.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/muvomuzaf.pdfPDF link annotation
    • https://promobryansk.ru/userfiles/files/zapevapav.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161392d4a211f1---wafibugazetofawufep.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/19226359073.pdfIn PDF document text
    • https://taperagi.com/contents/files/87557598700.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/19198609282.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/lowujapikidefoxezogesafiv.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/rupexofedizevene.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/91029904367.pdfIn PDF document text
    • https://profm.hu/files/file/43204505526.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/6666732431.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/jivij.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3faf6f3cb9edc012d5e3bd503a7c512f/sivexaraxut.pdfIn PDF document text
    • 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_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 10440 bytes
SHA-256: 6f4ac506ed3b6e38727e8cf17ee6b140280e85ab55485b0f8e9d17528647ee8b
font_01_sfnt_off00011c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001348d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348D 17740 bytes
SHA-256: 05d0a7397eb6b83e9300856a4979bd277d4e8f0572adc1c8d35f73e08ae9e457

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