Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f20cf476b89dd0…

MALICIOUS

PDF

83.4 KB Created: 2021-07-04 02:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cfa8da0aad48855fe982d259f9696206 SHA-1: ef51db7fb7ca18d480c600a79bf5958fa9798c03 SHA-256: c0f20cf476b89dd0e3058d6c247ce5723ee37070167b0ee70e69f27d2481f505
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://philabc.ru/uplcv?utm_term=green+screen+effects+pack+free+download PDF link annotation
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607838563b5eb---34002948807.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/fuzove.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/tilesu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fe8e5da90e41f113855f15d2cbcf0162/fares.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160918c97918f2---60537803496.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074afa463613---96424540835.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/e1676edcf340dd03799d6299cff29250/34379488924.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/ridotip.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/13668127339.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/90757412104.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/7446g487ff22nppt33pfhrtu40/nezorajoselokeri.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/54290638019.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/3voss4d07lip6vhinuj7kjlcq0/79042523630.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f7c25cd0c2d6884c0ede18aeed57a8f5/poxixegatu.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/95pf6t324o68qa5igqpbpnk8v1/97433072375.pdfIn PDF document text
    • http://homeopathyhongkong.com/files/50009338580.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/wodabitonob.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c6a73948e---32561546744.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb662572f8---56229383734.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/83703594114.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tuiukirb8lc6t7330qlkg8lfo1/jipotigomuvimew.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/kerirosotisuw.pdfIn PDF document text
    • https://bloomeng.com/uploads/81952980415.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ad4ec2f55---75760085959.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b71c95ff---bozububafal.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_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 17120 bytes
SHA-256: e4a34089ca36f90f417f5fbbe010992b3af32552f79dd45952126ed0b0a8176c
font_01_sfnt_off00010d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 10736 bytes
SHA-256: 9bec0d70652c6362b545b8827afddbc5069150dbc571d68e3aa5748c95a25000