Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecf9f0e283022fa…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 03:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e43a6ddd96b4f785fcef1e34d76e5e5 SHA-1: 4d0b3bf21e2fa4530efcb4b12c7802579f8d2d3b SHA-256: 8ecf9f0e283022fa8e9e561e3214f8ff853418e75d2ab32a52597d40c7954ac4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=root+android+free+online PDF link annotation
    • http://sameiroeventos.pt/ficheiros/nigowodosenatikobipoga.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140871e436b9---zuwejifajusoko.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210912044639.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/situmiv.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vedafizetibidowowopefim.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/zejabozap.pdfIn PDF document text
    • http://habibitours.com/ckfinder/userfiles/files/xamas.pdfIn PDF document text
    • http://szhlfz.net/upload/72170120744.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/67930799026.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/22849616388.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/betikenivonazevufedi.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/jilisuguvekiruvoguza.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a94515cd0b3b322e979fa58ba8bd205f/26773906644.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/jakunademiwovewipepan.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/98908668453.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/48667970371.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/34476581488.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/putexarazotejuzapemavogex.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/54646516360.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/finomelo.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/bevodisiboranekazu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbbe7ac904---59038660182.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/70510009541.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/46169294863.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_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 18328 bytes
SHA-256: a7f8f4149f365a8966f53cd8895152eb53e8af5ed3bb98f490446ab5e99c9e0a
font_01_sfnt_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 10224 bytes
SHA-256: a0aeb00e91d607ef35b1f71ef067266feb6ad8973931930c89eafb39dccfbaa2
font_02_sfnt_off0001236b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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