Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0961f3bd28c394…

MALICIOUS

PDF

78.0 KB Created: 2021-07-03 17:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: daea1ad38961fbb52c1bf32c43644653 SHA-1: 3d16a802eabbc540a0f977f44cdbcf20d12f9997 SHA-256: 2a0961f3bd28c394f73a55393a4ec808aa520d14a91ad1ded8a2e3ab34dd8b92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of links pointing to various compromised websites, indicating it functions as a link farm. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly suggests malicious intent. The embedded links are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078caaa32ef3---fesotoxegusijowatu.pdf In PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/53743031398.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788d09a111c---73034792563.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/19122399616.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4da361aab9---rabaresusavagu.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ae60fe9c2b4efb1dcaa976191e273bae/xalagi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26b844b730---43286781579.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/27606047011.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622436769.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/93546823896.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ca6b27444fa6f5e391e3a606373b2342/fepepijej.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/tibixatug.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/19838384848.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/1rbeerv78de6fjrit0u24s0rt7/56213774090.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf025658f---81909189062.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/41216641342.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c3f28fd5eaecca4cb147ede33473c370/xuruvabebisanamafokuj.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6c8b6058---vebot.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/vofelup.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/39751896485.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/zibewowabixidimena.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe11a4942d---xojimebejaditedanedavoj.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/pibepopibonisuzezugoxo.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/aeaa3d4c7f591d59fe6579a08b8595db/vuwojamibebamaso.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/36116249181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=death+of+a+salesman+act+2+quotesPDF 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_off0000d090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 16128 bytes
SHA-256: 4dbcedddf265df157933f1346a219ec2ce25cb4d32213cb8cc1023d426cdd48b
font_02_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 10776 bytes
SHA-256: 394f7412802b10121decc1fa1c9d360b8889f343e299c3231356d6fa4a28dafc

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