Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9aa0e5d83ada46b…

MALICIOUS

PDF

99.8 KB Created: 2021-07-15 11:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 74a76ef0b22cc07181089ba99268a983 SHA-1: be28db2b06729e0e4ba7df9d0aa34d3e99947aab SHA-256: a9aa0e5d83ada46bbd9480908d97a6bb0138b80940d814bf6ba4dd209dd84b9e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites and disposable hosting, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URI analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://medvor.ru/uplcv?utm_term=where+the+crawdads+sing+audiobook+torrent PDF link annotation
    • https://locoffice.ru/userfiles/file/vomamogumumafi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b6649de01---xafiwalixuzo.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/34219116307.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/wowunajunazi.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/99834540174.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/27251836156.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/ligibomogidugepo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a680cdb42d---wizapoxitavev.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/vruigb5tlfauppqnmg1adaak53/29707821870.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/91129913455.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/xukigovenak.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b85e7d07afa---jexezuvarod.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/punelarolez.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bcab70553---zirinomukamuliwujosuk.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2e92cde31---29124628298.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/970a76910155572eb5090d438030c2d9/81917307297.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jp5mc4p5e29bnpd2tcnt4ahtek/58109573792.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e15b22561---54806505557.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074789b68846---44354183447.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b590a6a6fea---javukura.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/95430010476.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf03996e77a---36818520631.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/97833ba776c626a334d0e19880ec9e53/lowatudoxoz.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607539faa4301---71983305916.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070816e04f22---viwobivajuronejunusek.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/24232444238.pdfPDF link annotation
    • https://ipaudio.club/wp-contIn 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_off00011cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD3 19372 bytes
SHA-256: d44b94109d7d47e0d7cd447c47f74f61c0445a478c49eafcb72924840c90fa0e
font_01_sfnt_off00014e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6D 11012 bytes
SHA-256: 9d93f5a2cfa2ee37f2e536cd29051633d031526071873692c7c346a59f933f0d
font_02_sfnt_off000167e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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