Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc2bf1ffec51e02…

MALICIOUS

PDF

99.4 KB Created: 2021-07-14 02:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f4033d36644654a576444aab51587e9f SHA-1: 2bc446222c702a33b16402867db3b591be20eb4f SHA-256: 5bc2bf1ffec51e028f96e1a92e27397732524158d01e484b7b4d48ea3ccb879a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document is part of a link farm designed to redirect users to malicious content. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=tell+me+about+yourself+sample+answer+for+engineering+freshers PDF link annotation
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/30b824ebeb2840a0c6204bd303cb9278/nimufarof.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/12683915935.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/texeladasipamosagu.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7d5d3dff6---39213202651.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54ed4463a---34741107127.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/zewalupete.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/lobojegaxedufonew.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/67810997524.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/xowanonerefawivenunulasup.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e8c5f14d4c064dcff7143f28aae05031/gokitumirelukalipiru.pdfIn PDF document text
    • http://placc.info/up_image/tipimu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607480d9ad572---dimunoxozosegumidad.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ts9vvip7hfktc7gvgg7dt12s74/pevezevuwovuwev.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/kemozewesug.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f73591633---kojerajijodisanagokigaw.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc7055cb45---98620141770.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2a5401b0d146fe6d06dfcb56d0f896e3/keluduredepegiboluki.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/58434538688.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/mezolipupurojabo.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607173f02bce4---lofipiliwunonekivobupume.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/lisivakopiva.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1796448d31bf90d013895c557709b180/89976299931.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/38003490740.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/27360140650.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_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13940 11208 bytes
SHA-256: a174982a2c5fa514c97e041ab852b50a2363a7030dfced1749bc5c9caa824ba0
font_02_sfnt_off00015326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15326 17260 bytes
SHA-256: 061fc8d25fc25c749af82d492efb73d787678085572cfd12fdeb1cb7222350ea

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