Malicious PDF — malware analysis report

Static analysis result for SHA-256 638f5e6913804c96…

MALICIOUS

PDF

76.3 KB Created: 2021-09-13 03:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 430ad610af86e519afcf85cbb2242ccc SHA-1: 6952711c76c7e69db8fa543e18e253bdfe148a00 SHA-256: 638f5e6913804c967cb61c6d81c6f3e9375f89aa36645a4072b343791ef4d3b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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 http://hfengly.dk/skoleportalen/userfiles/file/wibamipufejawoni.pdf In PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/85850896323.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/32776607154.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161318e7e1946c---tejenagebenegafuvumenode.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/16089234489.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/pubevodanugosizotisege.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbdec85ad---11697962332.pdfIn PDF document text
    • https://taperagi.com/contents/files/mitexegebufixiwiwu.pdfIn PDF document text
    • http://orem.mn/uploads/files/rudifafubibosilupewuzomo.pdfIn PDF document text
    • https://o-dance.com/upload/files/5167390460.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/18368835819.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/65719128972.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/52437697025.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/oaf9jr75d8m345ensfa8phi2lm/webukavazivob.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/funegadunezofeneb.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f37bd0d10f---mifel.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/sikuvugubujifanuj.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/52944882031.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/seguxuti.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcfffe044b---fisawufubijebobemad.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/18601ce4a3e1581f9f1fb0dee24fcf39/wuvonoven.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/87623402080.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/33523645711.pdfIn PDF document text
    • http://freewest.at/xizexijududegibufu.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/wozapimen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=free+clash+of+clans+account+list+2021PDF link annotation
    • 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_off0000c444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC444 10804 bytes
SHA-256: 75052e92456d1c8046c16feb0610e19945127e9b0754a47d1aa6ad5b5d5cfd10
font_01_sfnt_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 17692 bytes
SHA-256: 0d985546472b9ef000a5f728d0e2df62d3e52ddbc1aba6a07b39553e5a1a28a7
font_02_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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