Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac1fa116e9e98ce…

MALICIOUS

PDF

87.5 KB Created: 2021-09-06 19:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8587e158b08a30488974d5de5b6a2044 SHA-1: c9f4471a42d9cfed34e193413546ceb038c62a3e SHA-256: dac1fa116e9e98ce795bc32c10b44927c4c51eca127257787ef4e90bb8977da1
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 delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of these URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9709

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=double+entry+system+examples+pdf PDF link annotation
    • https://tideandtigers.com/ckfinder/userfiles/files/30865371997.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/tamajutobusuz.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/v7vb9nb8tnh0884bnrr5nsc5as/49252986792.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/nolariseratefiki.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609991b97f7e4---wixesitoxudip.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e187de6e---lunijizodizatifogolew.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/5418fe1e0a56d7d4d31e46942bfe40bc/78879792266.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/mudufowubalupezejed.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/58926120741.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/84616512237.pdfIn PDF document text
    • https://areicon.com/images/file/27944774754.pdfIn PDF document text
    • https://baptistfriends.org/media/jorubexubaj.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/pabatoxozenoboluwinizovor.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/4752939080.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/gabatatelolopuv.pdfIn PDF document text
    • https://paperland.bg/uploads/file/doduxidekuxisirilel.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/zokikomawojiji.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b88d506d1d5---zewexalox.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1187a95c17---31852950991.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60E6567B17E28.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/42538601877.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16116892395a1b---lefimavo.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/25613267066.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adaeead7b44---rovezitax.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/60120120972.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/13f0115dbe23557a7498c3c9aa423d9f/zudopaxixojafoxigidurafat.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DA 11024 bytes
SHA-256: 94cdf77f4c21e69dbadf09b5f51dd11fb26ff3d75c85f946fbc480095edfbb01
font_01_sfnt_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 1684 bytes
SHA-256: 9c928bf144e3eec6b0e52ae2bba533670589b2228405e28e178bb89e049a64b1
font_03_sfnt_off0000fed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000116eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EB 22136 bytes
SHA-256: 546af6b75bf43e9cd87529e794d498db4a83b66217973fbed0cb097606af0000

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