Malicious PDF — malware analysis report

Static analysis result for SHA-256 594e34bc9710dc38…

MALICIOUS

PDF

87.5 KB Created: 2021-09-17 10:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d27c70fbd8cf4fcc9637a433b42cb4df SHA-1: d0c0e5f939444db2cc22d4e069cd93e82b295d8b SHA-256: 594e34bc9710dc3849ee5716c9fbabf39eea0256cfa1b37637e620d7e81033d7
164 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 uploads or disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to malicious content or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=chrome+devices+android PDF link annotation
    • http://khocabien.com/uploads/files/83726803491.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/39510793502.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/wafigajepimonaleka.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/pefumuku.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/54970845773.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/bezojagodologatoruwor.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/16385195962.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/78704834970.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4d4da6f46---57613606249.pdfIn PDF document text
    • https://filetorme.com/upload/files/rotoguw.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9e75781ea---48712449089.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/65211681850.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e74a8766c8---nogomanisix.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/81260728936.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/suwawewegidanize.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a34992414c---68531096970.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/fadafekuzuvaborisekibu.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/wigobof.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/vikelarutikimowanopefewu.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/16328421229.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/67313816660.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/devininakadamogowinekuji.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ahqc6je5ec0edhnqf5tf6thrvh/jasodad.pdfIn PDF document text
    • http://annabarons.com/files/files/73789096505.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/zewop.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_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 10588 bytes
SHA-256: 3886d5c400eb3efdd81472a4c2d87b598f42ade6d52e9e1878b87eb86fbfed0e
font_01_sfnt_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 17688 bytes
SHA-256: c4953157e29d73e1ed1d5b06b00f9105d05136c959cdc22e4816a337ff4e5e94
font_02_sfnt_off00013849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1