Malicious PDF — malware analysis report

Static analysis result for SHA-256 768b8c4f55c9af26…

MALICIOUS

PDF

69.4 KB Created: 2021-09-15 23:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 797a4a9536c9c6b08805c279a75c7bf2 SHA-1: 6a1a0bbafe08adebce506d7c066fe6f0c99ab864 SHA-256: 768b8c4f55c9af26295174a867f6c811776831e0e98c102ae736ee80dd38010e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=antutu+benchmark+google+play+store PDF link annotation
    • https://tselectromechanical.com/uploads/CKfiles/files/78091495347.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/92504190948.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141130633b95---90350899251.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/vozimojekokagusizetowita.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/79233201569.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbbf9c61dc---14367184696.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/2600736124.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/57268870012.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161361b95baebc---jivujipo.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/wawugixuxavajomek.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/sikakideverineviwikax.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/wupuxelibusazipeduvaga.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/93924731506.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/65281021458.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/manefopeminet.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/kevaluwib.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/27315425921.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/38882273105.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/sunolegopediriwonuxox.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/42081885993.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/59450131249.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/dapufarofopu.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/vezegevomak.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/89193486148.pdfIn PDF document text
    • http://www.springperfect.com/upload/finder/files/74036604663.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_off0000b10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10F 11156 bytes
SHA-256: ce7fa33a448ed75e1d917846bd1187db79e07e17dc7ceb31d91223cfcb230b90
font_01_sfnt_off0000cadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 14832 bytes
SHA-256: 17fb49b25106c73726ae1fa9b954ef754a852f2d4a61ea541fb14feeeb5850c3

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