Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcc7e0ddef188db…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 13:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 80d5df07734e95b716c0b8053f294884 SHA-1: 289bcf11e97e9b7eab1ec5c31e5967cd409e4b5d SHA-256: 0fcc7e0ddef188db189e2512259aa7dfb32a8e2d277bb1243c0db09e30dbeafe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=guitar+hero+world+tour+apk PDF link annotation
    • https://www.domosystem.gr/ckfinder/userfiles/files/jajeradomonowega.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/807b16e1b034507eafdf78e8beec82c0/61085410103.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kojijobemop.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/nuwepino.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/17128808026.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219152255474148.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141c7216058b---75835194849.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/zekagukefigiminuv.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/pazagifasifedizozusome.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/92980398651.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/livexoxulumegu.pdfIn PDF document text
    • https://vitanov.rs/files/sevisi.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109111025134004.pdfIn PDF document text
    • https://ptogel2.com/contents/files/segeguwazerifemiripuxubi.pdfIn PDF document text
    • http://demkapi.com/resimler/files/wosurebenugi.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/kuwejamutudufukugud.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/rujun.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361ba8355c1---nenimanafaxapepab.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/1804366095.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/41290907175.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/32814008674.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/47776414259.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/jadomatubelob.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/tazigojeminuras.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_off0000b68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68D 10536 bytes
SHA-256: 2c7996dc96d4c3970be0c38b182a4dd3e7fe2e50b1b1012bd9b9fecb446cdfde
font_01_sfnt_off0000ceb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB8 16444 bytes
SHA-256: 1d89cf88beeb1e3a697c32cff630d753b8c42033546a1004fa2744e998b193ed
font_02_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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