Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b13ce0dab076bf…

MALICIOUS

PDF

109.9 KB Created: 2021-08-04 15:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8dc367ef754f43b47822bd05ac4396b3 SHA-1: a768b4265698732dbd6ca7bc2ea36d9960bfb215 SHA-256: 55b13ce0dab076bf013736cb9705f785ea61b4359da6b2e51a5715e2cecb4782
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f17bb80e6---54490743095.pdf In PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04c1ca711---37797627898.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5b2de9458---26388093281.pdfIn PDF document text
    • https://sanidom.pl/img/file/watabetabudofavobikesosej.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/71180729188.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607c334825d1e---71982441493.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/b28c8a62f9713509259da00a90ddb538/kofojitotavidomol.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/lowerejelubusuta.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/dugagiwuz.pdfIn PDF document text
    • https://5uempat.com/contents//files/vojitutu.pdfIn PDF document text
    • https://digireg.pl/upload/zabagogibewavudonude.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749e0f82470---99186809131.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092feb5b74be---94570797174.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94503ba11---37699584277.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0565826d74---84788056661.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b17e64e0f---xotedudoborozakawo.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/95361033284.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/xobuvukafepodesit.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac238beb25b---33106943675.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/078fd9c2a540bfbd2aa6946da8b619e2/48793328682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cuentos+cortos+para+ni%C3%B1os+pdf+con+imagenesPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/84673368359.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12984 11252 bytes
SHA-256: cd4af3619b92dc1ca269477f025befce3bed6e5b218c4e1910b3693596d360ec
font_01_sfnt_off0001437f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437F 18768 bytes
SHA-256: 3c56b4a20c138239e5f5bad9a9075b94c174a2d237e48052c00557be024ce4a4
font_02_sfnt_off0001732d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1732D 17504 bytes
SHA-256: 0b4b2676aff05a369d4163ffe00cf7f13052446fb04b9aa9e6dbf30e7d948870
font_03_sfnt_off00018d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.