Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71271c4c4d879fd…

MALICIOUS

PDF

90.6 KB Created: 2021-09-05 23:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a9b3e481a7e0e41282400a4c85b4b4b4 SHA-1: b7ec970f81c154f684ac6a6eb627bb693a091035 SHA-256: e71271c4c4d879fd883363b2d2ee3c7170eb6e975364c3ab3099e1fddeb8fc1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=convertir+jpg+a+pdf+mas+de+50+paginas+programa PDF link annotation
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/tt97s61eb9s21arr904mtlfbb7/11600070312.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d034370e4f6ef4f72d8102916ac0438/5912298414.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/d586bj6p6h70ncccqgua0lkb85/buxejenonakojeginajuruko.pdfIn PDF document text
    • https://samowar.ch/upload/file/lavago.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6g1pasea1e5k6v05c3nhftdtp7/bagolafemikowipelususipu.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/bobuxazawixafijakaxamigu.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/bc1e875a6ec69dd6ec965190c234ac94/rosulufilikukapewozim.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/73834600272.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161097336c88a5---97583070303.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3db4f6bf9d---wubeje.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d11dc1bc9---jiwigoropaboba.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/86122455697.pdfIn PDF document text
    • http://emannsltd.com/userfiles/8174909443.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ed8c69230---jefuderafisufopaf.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/75d8bad1d6e8709e009bc84ce5873500/rivitaze.pdfIn PDF document text
    • https://pecsikult.hu/files/file/lokowesapo.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/21848540704.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/baxij.pdfIn PDF document text
    • https://wsbtitan.com/images/file/toretunetidez.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/48384908240.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/29001743393.pdfIn PDF document text
    • http://asustainable.com/global/file/77989475038.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/givugiwog.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/40880825b4b3a17316c980923b6b8130/papaxuko.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_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 11280 bytes
SHA-256: d9c8411d60ea5f1812eacbb0aaa1c4324d34f21f0465f7191832fbb56dd2781b
font_01_sfnt_off000113ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AD 18604 bytes
SHA-256: 2af7e7d2236e12d3eadc6191c7b6bfa18ad8572ed4e5561ac5c8684ddc881f3a
font_02_sfnt_off0001446a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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