Malicious PDF — malware analysis report

Static analysis result for SHA-256 80373638e6245d51…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 18:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cd3bcb10f8360a4a3980d4fea36c8f03 SHA-1: bb9215b094909521581882737187bf378994ac62 SHA-256: 80373638e6245d5133f7589c0597f0f4817d28b01e0d898fc0cff5f14c67528e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. These URLs are likely intended to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://studiosaletta.it/userfiles/files/44205394372.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b86ad2f1814d1a264c9f78a0ceab8ee4/49684864654.pdfIn PDF document text
    • https://ismart99.net/upload/files/jajivezasadopivokolenujex.pdfIn PDF document text
    • https://digireg.gr/upload/muzewaxefexezewiri.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/tavopewebimurusu.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/limazunoka.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/93130503411.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/popobovon.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/231867b492cf70f210d21811ca40e405/vazilukanebolasasodig.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/mologemuwalof.pdfIn PDF document text
    • http://fgosvo.ru/files/files/mibosaferatovos.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae157167b6e---22715383379.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/2101681172.pdfIn PDF document text
    • https://rcot.org/userfiles/file/guvirijekoraralakafuji.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/vugiletufimebu.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/14224488644.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/vosimukogak.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/23f18fbabc6979a061d961904b987de4/pidukorosonudeninu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f63148a544b---noribudatukudowexex.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/xofeseweso.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/refezo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869018d629a---tikubivafavujuvowikutefu.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/ligunasafowanutifijosa.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/doten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=international+business+entry+strategies+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 10976 bytes
SHA-256: e270a0fa58b7052d2498e9f5eb328a0494334811224a63c9b2d36afd59bf9a42
font_02_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 16848 bytes
SHA-256: 5151edcdbc3a20d3f9cd706a2fb748ca86e6a1f11fbcda184b3eb5cc50137e78

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