Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02921c20c57de53…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 00:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe04d823f02210c31578282fb0e04184 SHA-1: 3014195c257a8c95f259265c7e40d37683759763 SHA-256: a02921c20c57de53343ad29f398edb2ea255bf4eeeeefc90be83753ac710b56d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_JS and PDF_URI heuristics further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ecd7d2d5b8cbfcee2e9242e1693c00ad/92387719371.pdf In PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607844878e24c---tumerijutuxubanamir.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/3525895753.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/89457139065.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084d21022225---26669655823.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/zexevorifebo.pdfIn PDF document text
    • https://dcimx.com/files/larewuxakaridal.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/piziko.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160fde60659a9b---jegikizaderinedavojuwax.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/kivewulux.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/rulawej.pdfIn PDF document text
    • http://emauto.lv/index/images/up/file/5744856553.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/54350070235.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/608bd85b8d49f494608a4ba36961375f/44403638260.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/sagusowed.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/65730945336.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/88107455057.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/wumufekafizoj.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/domamajejoso.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11c6c9086---45415441394.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/064mm8it57h0p468md0jmt1c0k/kerodutekatozepexutibi.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/90021501738.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffe779de621---45033677680.pdfIn PDF document text
    • https://laps.pl/userfiles/file/dagujimose.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/xileripikaxuninedurunuxaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=stefan+zweig+chess+story+pdf+downloadPDF 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_off0000d37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37D 11232 bytes
SHA-256: 8bda2f97078d64d7cc56c44e0936f05dba4428b5bdfe34170362141d88dd97dd
font_01_sfnt_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 17012 bytes
SHA-256: 994815a3bfb75faf0f6b99cdd24600c68d0bc0c8cc13d30687f8ce42890d7a4d
font_02_sfnt_off000119fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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