Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9fcbffdd88966e…

MALICIOUS

PDF

94.6 KB Created: 2021-08-07 01:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5f1aa19ed75b8c50b03f16cce3af9c73 SHA-1: ab2e0f350b557231380c421487de8e0e15e0cc6f SHA-256: 8d9fcbffdd88966e706bc6288b372f01b35cbce80f0d40bc90063b9c9d89a008
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to download further malicious content. The presence of numerous URLs, many hosted on compromised CMS platforms, reinforces the phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ahkkpcm.org/userfiles/96642994304.pdf In PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/b57c8ea965d4c8f9fd1545aa5d29a318/nejonuwadesirelapaka.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a27625f117---zijiwedevakokogaj.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/39546276065.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/tadawojibanobufaluk.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071740377f44---zipawawakoluwobejizilupa.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dgif1jmkkge848esr5tm845hl6/96113803985.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788320177b0---sirerajefur.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/vafigibenisebabi.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/7c081f1946a576c256eda7259b8c4495/midafonibisiri.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/05/file/20210605_142514_138.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1ac062866---99216429412.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/gidenipigalanozapo.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/35867162205.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/biwukuzozu.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/ganiwexosekopovuwisibazi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f275c8d7cc9---48053531762.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/degasukezabenikojanewu.pdfIn PDF document text
    • https://valdisieveshopping.it/file/saranapekatug.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/94791072934.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/totawiz.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/53b7154d5bf7093222ce17128663071c/wasogubilitisipepinobovip.pdfIn PDF document text
    • http://salkim.com/userfiles/file/26491479833.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d3e4c739---9531575855.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/moripuwiwemuvigowuxafaf.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/97471388514.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/55564414103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gta+san+andreas+indir+oyunuPDF 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_off00010a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12260 10448 bytes
SHA-256: 4bb64fccce272b8b122038c90e6feeddd8fd08a6dcffa4d4940b9a4672ef96a3
font_02_sfnt_off00013a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A41 19700 bytes
SHA-256: d907a24772e3728023a7bb58320de5bab7fdf87b1362f71c73c830a73aaea617