Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c69001683312de4…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 07:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 293d0f67cfd8632beea4260a76eb87df SHA-1: b128f0b7f5fdd4812070529da606602dd8ae2038 SHA-256: 2c69001683312de489c26189bef91d7bb9df85fa884dadb30c84ee459cce9876
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eatorhours.org/e-bussiness/fckimages/file/vujelab.pdf In PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/07a47edaa99b51cfa88a3b508709d338/59754334196.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5a9245ad3f71554cb6c9d3a8771661be/kivuramupoz.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/79645938558.pdfPDF link annotation
    • http://medica-eg.com/userfiles/file/selutitesefinate.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/43396578543.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078df759206f---57273170402.pdfIn PDF document text
    • https://premiersuli.hu/files/files/82490724485.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/jaxijefixajusot.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd11ccd8d40---xirovetibamidugajisiru.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0335be415d3a9368441fd3bd72d45978/18983273893.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b2f1e459f---situvarase.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609128e85013f---54462173738.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/983de9230fa5438e1c616fa6bdbb9458/81813116763.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/punipekaxe.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/xapuge.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/94317838645.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf80570abc---17664347742.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bae18117c0---16426730462.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/budajenaze.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/t2ur07gdin7dtishgs2ghmr1hb/24027452237.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161041ee5f0b59---65085762870.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eaa0c6f57---rififobejatunudesemipil.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/zugogudaxododidobelagop.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/g84m1qon3qgkju3r9td6lr0p9r/puzuzugovowanudakutimote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=lower+arm+muscle+diagramPDF 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_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 18208 bytes
SHA-256: 6ba0bc98ccd65185880e32d30eb973a37a5db600e4f18573ad1d8015ba4251ce
font_01_sfnt_off00012127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12127 10656 bytes
SHA-256: c0cc6950504c47379de80107345959d89b0118a83ded421e9bbef5bbe33d2826
font_02_sfnt_off00013965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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