Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf327cec104b1b6d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 00:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4b63cdce499dfa9b9675b03effd9d2f4 SHA-1: e5578290c5c2e20651f5f63be344d54903fbd1b8 SHA-256: bf327cec104b1b6d3242f3ab3dd47caaa0303a4182b0fb4fda9a4328e97131e4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, including one pointing to a raw IP address, suggesting it's part of a link farm designed to redirect users to potentially compromised or malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document's primary function is to host and distribute links to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ytlcases.com/userfiles/file/gamozonerusuvakivi.pdf In PDF document text
    • https://centaur.vri.cz/docs/files/babetanenorixune.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/68763651960f84057df78d.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/sibojoxabunarajabikekeb.pdfIn PDF document text
    • https://le27.fr/docs/file/tiwigekopazagelivez.pdfIn PDF document text
    • http://idcla.net/upload/files/katemoxesesixegub.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fea0b727a---tojajudigujuniga.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607771ac3b0cd---zibokeze.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/puzugikojezonowidazutonev.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/59163de65e542191f76a0836cd58613f/nakuxefider.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/21928146184.pdfPDF link annotation
    • http://bekkercoon.ru/ckfinder/userfiles/files/97078155150.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/vikinipakefemepopido.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/34072643310.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/warovis.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/8ca3849dbc9560494bc277e9f895d65d/21966665494.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/27117157611.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/muvev.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/93671984154.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca39571617---41159046731.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/69885531069.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/15124e124c254e1c38c76be89f4e332a/12203731106.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/8n94b6t2jbarb42c1l2d3fe5b6/zerokazolozifuwudorerataf.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/44733182686.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3f7e1969822de1ba803beb7464f1d7f0/kipizifopelarawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+convert+doc+to+pdf+in+word+2010PDF 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_off0000cda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA4 10676 bytes
SHA-256: fb3edef14a9fb804206b1a626c73344a8af7d40c3ab64171019eac247d9d26e8
font_01_sfnt_off0000e64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 18640 bytes
SHA-256: 38b88c93b9fa01763e5f2c69eaf52cfa13d8a53ecb5a94ffc3be1bccfeee74f0

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