Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b0234f429242f7…

MALICIOUS

PDF

162.2 KB Created: 2021-06-24 04:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7b3e1586d1a78e3af0e4d05f7290862d SHA-1: 708fce631f58f11b053d3a96f456524f7d6d5c5d SHA-256: 53b0234f429242f7af3a0c2a6000823d65d482c6b4d5be51e655d91588182323
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded JavaScript likely facilitates the redirection to these malicious URLs, contributing to the overall phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=by+is+which+part+of+speech PDF link annotation
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608290a410318---55474838092.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/uhpala2qo7l506l9jaco75nss8/merumejeseguguwe.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792e386e5ff---sanuburigugikobebofi.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160757e82c85c3---rizusegemegox.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ff1e43ec00b0c55d357d55131dc361cd/moterikeguwuvasu.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/xolinoregodebi.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ab52dd861e172e4599598ab6fc40bd2a/kuvafawowemexozip.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/95946015570.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6732abfff80fa608cd865501b2408dc7/mefurosunasaxorojid.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/xoxenovajub.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb0cf64c07---zatepoxered.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/22080998612.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/54922890407.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/33987155937.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/lerojejesijezevid.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/71142045619.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ae92a881a33b0a6ccdf833b5f6930461/9372267758.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/36a7143f99edc800ab64bc3a3f4a0992/7431146682.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607da4faa9a2c---75274129101.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001b436.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B436 12160 bytes
SHA-256: 1ba302d167d45c9461677b1f9e97cdef3f55669535b566f7e57701551019216e
stream_006_off00022309.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x22309 31804 bytes
SHA-256: 37726ab942390b0dc308ca580b4f3c93703b382e9abf77542c4c67e58083589a
font_00_sfnt_off000134a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A4 35152 bytes
SHA-256: d76d6e35614f875eba72106544db10f8ce9c41a37988f5b0d6a10f2c52e69b14
font_01_sfnt_off0001a213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A213 5312 bytes
SHA-256: 96dab162a52750103e4cfe6882a48c5c79331951de94dbd430418c7a880785a5
font_03_sfnt_off0001d6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6B2 30304 bytes
SHA-256: 5a3f77a587f6baca0121fad3caa5141a94e551f09fc719fc7ec8b1770aa57bc2
font_05_sfnt_off00025a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25A62 9104 bytes
SHA-256: 21d6b6306d59e8d9d902fb8398b1bdd40a06af30bc55d6d803fde5dcc12a5122

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