Malicious PDF — malware analysis report

Static analysis result for SHA-256 901044aba61b62e9…

MALICIOUS

PDF

73.4 KB Created: 2021-09-03 08:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e02c344e959f5774b3f31bf9eba9b7f SHA-1: ff5eadfbbd4a46037033d927136e86ae0b420d6f SHA-256: 901044aba61b62e9274b2ba572e51b4b2e6abdf186a0a95db915c128081e3047
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm with numerous external URIs, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution lure. The presence of multiple compromised CMS upload links further supports this. No scripts were extracted from this sample.

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 https://pasarangroup2.com/contents/files/bukigepedekovog.pdf In PDF document text
    • http://maymaygiaydachidang.com/upload/files/sekibor.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606f090cc855a---79010177404.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b40a3ff500c8f684666f78c7b19b45d/jiletupobozawes.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/43145954957.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/68930960311.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8fc02da5a234246829adc5c443aa062a/78426942873.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/tosix.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/notutis.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/mjfpu56movp0gmftm7jn0pcc3d/70850765159.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/51896423285.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c42e8cf47---fuwibukafirobop.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/vovorodegozedufu.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/96187291556.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/dejodigulokizifu.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/77560474020.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607265f890c0d---75748187888.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609a71a0de51f---88171093721.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/76613949877.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f2d0feb9---dikija.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/wolefaxabowimafev.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/13063534044.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/74425125216.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa11f6acca2---29516635900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=idsa+sepsis+guidelines+2018+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_off0000be64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 15792 bytes
SHA-256: 39db5be35304b8a7f155d6e39a105a97ae6367193b4654173af3008ca02295fb
font_02_sfnt_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 10908 bytes
SHA-256: 112064c5fcd58975b72a125c4ffe52fe7dfe48fc4b723c1ded734c2bf4a03023