Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7716c9e7a65ad13…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 09:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a017026f8d1b9f5d75f66d07b8d8499b SHA-1: 4fd80141c63a39e049e372d729a767cb33536275 SHA-256: d7716c9e7a65ad135d634e19f5ebb1cc3cb6011d20c0b5eedda7a9075b4ddc7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised 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. The presence of embedded JavaScript points to potential exploitation or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=windows+7+portable+iso+download PDF link annotation
    • http://imobilestore.de/userfiles/file/tigirefagutotoloteronuli.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/28607490462.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/xutofedizaxulavusurodeb.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/22285193971.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/54216728295.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/wexomataxunamafapukosan.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/tetujafune.pdfIn PDF document text
    • https://suruburi.net/mm/file/bixazofigivena.pdfIn PDF document text
    • http://splogservice.ru/content/file/17807843924.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/80026636555.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/36811445335.pdfIn PDF document text
    • http://elma1.ru/!upload/files/lokokiwidulef.pdfIn PDF document text
    • http://abwessex.com/uploads/files/gixoz.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/57358105af8f76b3a4a410255fbfd9e9/57345047537.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/69368660099.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/13537996540.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/25692720798.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/53103071093.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-14/20210914113438854475.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/41884006687.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/lipubakusu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d83664b5a0---75576349885.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613651e15767e---44233753181.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/68609851541.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_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 10652 bytes
SHA-256: a408b0fba6c25b1140a87a78023f90545a3bb518e3c73ef9554b25ac4b46e5b3
font_01_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 16652 bytes
SHA-256: df16eefe2cad398f651ee55d39452befe47aba1a6cc1472203fc5f92d0f48016
font_02_sfnt_off00011d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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