Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d4ef1088eae55a…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 00:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05e4c33f50f370be5d5e160146e7f68a SHA-1: 0336c412640681e5a7b517be7583f55c51ac0ddc SHA-256: a8d4ef1088eae55a7068032b29bf88b32e861e1203f709c7813ec00b3059fb71
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and the overall structure suggest an attempt to lure users into clicking through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607691865cde8---kagubajifusog.pdf In PDF document text
    • http://dok-vo.ru/userfiles/file/92441946979.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b01a4a37f9d644136728651086520bb3/zawedabi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/nqno6fkp9ea1dsmka5vjedvp2v/80055044450.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fda05755f4---26079986342.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/ligusanapudilifusapin.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079fee50e015---32383589624.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1611fef5f3b666---ferurobowipusetujenib.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3acbba89459836d9ac608a66741e0db1/nimeruxokod.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/89982636607.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/34315086238.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/447f1b963d2aedcf4a96e923d1cbf37f/kedopafesopejuxagaxo.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b049e3ae0---83393131779.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/9805600060.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080e46188a0b---dakinawefusogafunofaf.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/nuzudotopabizuvamev.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/matewawinodagizujuxelew.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210618031355.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/kinubujavigefijujipam.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/kujuvejomuruwopip.pdfIn PDF document text
    • http://nessium.net/userfiles/file/63623259328.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb495fb374c---40217386184.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f28cd349676---dukalurilizinexakebiz.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/bumorobojidujada.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/94102757626.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160824e5b023f4---foxikejinofejeben.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=silver+chloride+plus+sodium+nitratePDF 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_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 11020 bytes
SHA-256: 7c1d0ee25e550b8cc3a956b01432be925b09aaf87f587f6bbc623b8463480c71
font_02_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 16476 bytes
SHA-256: 36f922043fa9fb8a75cdae06c1f21f398035148adf68e3f374591b9fae67f448

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