Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b4f191fd21ee3b…

MALICIOUS

PDF

92.3 KB Created: 2021-09-18 05:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed32e04a798210f6964dbd3fe01054bf SHA-1: 584481bc9f413d302fc1863e9516a2f27404037b SHA-256: a0b4f191fd21ee3b7b9dd0968f15a2126d3bff52862832eca824d1036a82e1e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://drafthe.ru/uplcv?utm_term=very+short+adventure+stories+in+english+pdf PDF link annotation
    • http://asid.rw/userfiles/file/82388787050.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/7706791246.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/banizumix.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ce4479f98---10730636302.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/41577368657.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/tobevazokarer.pdfIn PDF document text
    • http://kes.org/upload/editor/files/pamuvawozejofedusenepibi.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/vebidifupejuvovowinurot.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/51756707925.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/taguwifos.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/sonad.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/kivusakamoluv.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/13882733964.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d663dcb8fab741bc10d7332e298da196/desawomadidifanitubipi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136376654476---zamekafaxanatun.pdfIn PDF document text
    • https://termoformat.md/img/files/pidedabunebiwajeno.pdfIn PDF document text
    • https://value.ae/userfiles/file/305824925.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/60205216692.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/bexafapumek.pdfIn PDF document text
    • https://bdata.vn/upload/files/95247202012.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210903202421.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/jezudel.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/wejatizozegadekagafonor.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/29466414529.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/siluxapupibosapevumigu.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/rodewatokulirukizopeta.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_off0000febb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 19288 bytes
SHA-256: db850941bca6790fb49ed674c1c1c6f3e742bd3148c08f4403ba61342e7f0091
font_01_sfnt_off0001314b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14962 11028 bytes
SHA-256: e01614e91b5495a2db739a0b9d372caf89a997c9072fc09a9aafb34528aba7e7

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