Malicious PDF — malware analysis report

Static analysis result for SHA-256 8150edc84b6cc884…

MALICIOUS

PDF

83.1 KB Created: 2021-09-24 04:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a6a23d413e815dc4af6c9d2c4a655e47 SHA-1: 9054da6a14b99c93b36f04add9743b22628f9a8c SHA-256: 8150edc84b6cc884ff068e0cf71e1e37f39e621417360d5db9d689737ab08be3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF link farm indicators and a high ML score supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://namkhoabacninh.com/images/files/fejujeroz.pdf In PDF document text
    • http://fiumaradelsossio.it/userfiles/files/81198238981.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161341ea501fe1---goxoxitasevuzaji.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/jomeziti.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/473f792cd7f645f3d1065b7f62f8f759/nozazora.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/xisegetulixar.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/10606044147.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/92000278490.pdfIn PDF document text
    • http://dobermanncz.eu/files/85638951428.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/vawisu.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/zasipuromegijisugudex.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/powajewerito.pdfIn PDF document text
    • http://kachelofen-prommegger.at/41896315037.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/40280249823.pdfIn PDF document text
    • https://hobbypet.cz/files/file/ginepifatimokikozakovezel.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/jusijinulasalove.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/8266018526.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202191980404114.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/64096204063.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/53195966668.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a211fc973e7559df4cdab8f1a1b7fb2b/lavovevinen.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/24250337568.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/86504079770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=apple+theme+apkPDF 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_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 10004 bytes
SHA-256: 6baa3aa702634cc1306ebc5c7f6bae1d3588fb3b2293c7856622c7a7bf4e2958
font_01_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 18872 bytes
SHA-256: 1622d015158cf806e4830152c39e9708c6cf161ceb43af628f6041c1c3652624