Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b01560a11f6e7bf…

MALICIOUS

PDF

74.0 KB Created: 2021-09-06 14:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5060d9838a57662511bf425e9c4b6d0e SHA-1: 1ea4460ed66dd0a6eb20a3e04c0e95d3332c826e SHA-256: 8b01560a11f6e7bf535f1aa6069f15851f2be8b6441e2a31c134967c5c909e52
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. The file's structure and URL distribution align with techniques used to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://harc-ias.vn/Images_upload/files/mabofumadulaxesu.pdf In PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/60997726256.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/13852413077.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/repofafox.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/7564914547.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/8324033725.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef0180a269---4054477252.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/bakagateselowadovamodixol.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/80509998987.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/95062631444.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1ecb528ad44216322e0a9d5b9571a5cb/xojexe.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/tetanepupidefu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e5089a2708f---wipikutodumepe.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/lotukadivoxurufasesozofuf.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/537023d4e1599fbd46ba8b58390ea630/43981870596.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/kaginorebapoxo.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/qljjmddn0golvq3eeaqbfcr8jf/79082389369.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4b6763975ba3448f27a605e09d3398b1/39724933669.pdfIn PDF document text
    • http://wjcopy.com/upload/files/wapirunisepapivewejigabo.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/61222690602.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cabf515384---kuwosuv.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/tiforapifemir.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/pexus.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/732e8e027e02def19adf35d67925720c/solixoniwedunuvewipizixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=jurnal+korioamnionitis+pdfPDF 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_off0000be92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE92 16812 bytes
SHA-256: 5f870315e33d3e6636f8ae654109a6d2fc6b4a70de39bce16b4c427233872e6b
font_01_sfnt_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 10708 bytes
SHA-256: 19bf9811046f8b1cdf99757ccc49821e938db11f59efe8eb33212e7ce9308ae1
font_02_sfnt_off00010237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1