Malicious PDF — malware analysis report

Static analysis result for SHA-256 21544a2d45e01003…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 03:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8d68a08d9d0e2f2e77a7b252371dab84 SHA-1: ab778fbf73c37438a4dd65f2f68e7201913c63d1 SHA-256: 21544a2d45e0100368f843815990f2a134b3fdf2b960b6bd3f4dede8cb2ad8f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains embedded JavaScript and functions as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pixomot.ru/uplcv?utm_term=best+music+video+recording+app+for+android PDF link annotation
    • https://alshaabcoop.com/userfiles/file/53758710850.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/15759274438.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/tazitupebumoxewepojugojeg.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/vusazorenenuvajovogo.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/12142025425.pdfIn PDF document text
    • https://mmszke.hu/files/file/buvitenifofuwudidi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132be2bdc499---70021414733.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/8659082016.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/kuwejamutudufukugud.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/65192661566.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///kiromulidarur.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/sefumobo.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/56551874032.pdfIn PDF document text
    • http://orthopediedelft.eu/files/24085605236.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/89050550399.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/gixuzogek.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/xojavizir.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/datirilovowolokisuw.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613347a0249cb---nulolulomugod.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/vafunirotekigukedonovi.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/6057558913.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d5f8fc50cddd7f33868304f3fc9334ad/20339346721.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210902091121_c2lnYWZ1bG9rb2t1.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/sutakut.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/55163627980.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/nilanolugivu.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_off0000dbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD1 11136 bytes
SHA-256: 2b5d2270b503583da6089fbddabbc3f9169ecbc08a72f582346cfbf1aafb44e6
font_01_sfnt_off0000f5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 17244 bytes
SHA-256: 9e4b2f44c4420352daa870e4a297dae279cf10257e0b30797cb6a5b0830e6c45
font_02_sfnt_off00012275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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