Malicious PDF — malware analysis report

Static analysis result for SHA-256 f059b690af4f4141…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 04:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96752a1eb50cf18343460a264e9ead88 SHA-1: d96fa97cd4d4b576c73b85907283029593cb6978 SHA-256: f059b690af4f414148f07d4e60f3a1851a4af6d35eb39aabefffffcfa532fbd8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains JavaScript actions and a large number of embedded URLs, many pointing to compromised websites or disposable hosting. The heuristic firings indicate a link farm designed to redirect users, and ClamAV detection confirms its malicious nature. The presence of JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://inwebjor.ru/uplcv?utm_term=boris+and+the+dark+survival+android+download PDF link annotation
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/crulcc3sd1rr8demiufqbrtire/91544517405.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16149d33f1a806---18042619818.pdfIn PDF document text
    • http://rs-entp.com/upload/file/10681350129.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/pasugofapabasoxuduzemek.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/52509303167.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/84308381861.pdfIn PDF document text
    • http://aprt1day.ru/file/94315153802.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/badetuwepuboz.pdfIn PDF document text
    • https://equalland.com/uploads/File/94010558783.pdfIn PDF document text
    • http://iccarrentals.com/files/file/99322519035.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/juwujiduvusuzomoxapu.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/tekerazozixo.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202191746189310.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/28405828030.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/zijolimadogerasedosezola.pdfIn PDF document text
    • http://goldia.cz/data/file/gazubu.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/43007227243.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/60834416670.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/tutaxasetujeso.pdfIn PDF document text
    • https://best-label.com/upload/files/xalonizijimuzev.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161421303e53e1---90784506169.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_off0000b073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB073 10744 bytes
SHA-256: 5ecfc647f83f8c27ddb8f5c3e3f7d7e0d25948d17949389f417f74e3ec118e75
font_01_sfnt_off0000c925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC925 16600 bytes
SHA-256: e55fb5525958ca80099e4aad05318c9e9a86e8f04fcc9e9cda0faaff76a1db16
font_02_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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