Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a645e0dba1545bb…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 20:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2cb9e15322aa04192a481b1c0f32e253 SHA-1: b49394ada39f39cbeb3cb19101ef0ab9003c5b3b SHA-256: 6a645e0dba1545bb696764fd9c306713114cee52d5876786126c5dff57ebeeb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=how+to+make+pdf+files+smaller+mac PDF link annotation
    • http://clinicaveterinariaalbese.eu/userfiles/files/pobisinerukufiwis.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/terinizopivuvovikirewu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b844ce03a---kopuxoxetili.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b68b6bb63---sezadepixojarupofirefa.pdfIn PDF document text
    • https://highrise.pl/file/kofivibove.pdfIn PDF document text
    • http://rayer.cn/d/files/21458243830.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/60893055604.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/93294732894.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61a56070b---20429731552.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1a8ab77ba---37273390743.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/pifutumibuzagilomamu.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/ruzexenomarapegimutofik.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/71658180852.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/wurosivakumadesaliz.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/rupomekasuvonupanagapow.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47877817366.pdfIn PDF document text
    • http://glassick.com/userfiles/file/filatavil.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416e32116e8---11561148200.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/92395935731.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/48237514608.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109261632561275.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/xatexoburogusuren.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/lojiligapa.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/79438260161.pdfIn PDF document text
    • 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_off0000affe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFE 15688 bytes
SHA-256: 2329df8395a40ddbd622b8dc01703b8c6b99723057f13ad1d7afc344ac2000de
font_01_sfnt_off0000d7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C1 10848 bytes
SHA-256: 383c54d0ef8f56d2bf1ba5f76dc79479cb93bf1c4c515d03f314d574ef36d646
font_02_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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