Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3e367847a493b4…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 00:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4ef136d76303dc2134be7a69322a1ad SHA-1: dff2765b97168c3a5acc59a50f1080963767eab8 SHA-256: 6a3e367847a493b4da2be1eccab85dbdf29679e6c56aba2b008a25fdc8503868
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to compromised websites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8081552f68d8ad947ed3a2e294706e46/jalowaj.pdf In PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16080167c7bf92---38949214975.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/zavivosijar.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/2652e1304f5ad3609d4945cf3e793587/mulisixinugi.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/98490549222.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b0c89b26ee550772d1d1b3dc87c809c7/66891429696.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/lomititukobonaduwisexotup.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a37c4fac327---28613185701.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/pikokewenupisegulo.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/zudorazo.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/86397982952.pdfIn PDF document text
    • http://gojjang.com/uploads/files/nitunesaroteri.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/b6382ff2a03450f81ea0383ccc3af1e2/feketulawazizemelapep.pdfIn PDF document text
    • http://jfe.hk/userfiles/durunafuraru.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/fozowulatojevude.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/kasotebufederefajoguvopo.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/44306850276.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/libizusemolezegeladepaw.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///13302351895.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cb5d64b85215a44893449a02c8653680/41577924218.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/61633815332.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/kejaja.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20b215659a404596fde6982b36869656/19166357873.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a810cecb3cc---tazuxumisetatozuguxuluk.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/70839737811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+stellenbosch+mafia+inside+the+billionaire%27s+club+pdf+downloadPDF 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_off0000c116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC116 16548 bytes
SHA-256: 05ec88dd33792872584e6833bfe5ad7cbd617b530ddb6468dccd15de773b5e1e
font_01_sfnt_off0000eb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 11208 bytes
SHA-256: 2969c896b6ce30f236a73ff268a755b1578f507e78c3578c4eb8e40d7f8d5a11