Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ad805c90df23ca…

MALICIOUS

PDF

89.6 KB Created: 2021-07-30 22:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a3f2902bf1c17431134b456ad0477d1 SHA-1: d129c7f44822ea2f0ec96a0e9aeeb84c8b4461e3 SHA-256: 19ad805c90df23ca822725bf200d57cf7d0463513f189178bd3e24c130e6008a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or for SEO poisoning. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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=how+much+are+royal+doulton+figurines+worth
    • http://bigband-ulm.de/userfiles/files/64592748694.pdf
    • http://agama-rc.com/upload/files/tarizuwolu.pdf
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/42414145176.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078f095a1522---jedilevokodofivo.pdf
    • http://helloshoppingnepal.com/userfiles/file/35125621781.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/aqv7mr54f8j604hlraqd054f17/19538760319.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c8d5f327ae4---7436430853.pdf
    • http://kennycojewelry.com/userfiles/files/202106/1623766077.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe4ec2d61---dogirorefatebiduzutiw.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac4608cbb2---41000261937.pdf
    • https://egca.fr/userfiles/file/jixodumazo.pdf
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/81a56f10626d9ac96f4c076a231810ba/56343238390.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/mhid84m3374o42e6tem6mpn9ms/romubipezirel.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/cc256bfb5b053d635ef1f94cb0f5ce7a/poxone.pdf
    • http://daearesort.com/FileData/ckfinder/files/20210704_8237595A8AD8973A.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161006fbf25b68---73530081657.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/9258672057.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/65352964264.pdf
    • http://korsorlampang.net/user_img/files/savimakegedizu.pdf
    • https://uclerbaklava.com/resources/file/kipukevobanakenawusu.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc272746791---zitif.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/00ccd3db7e3e598bbdf14c3b3ae620eb/70715341743.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a2eb61aed013b463be8a5904a778b266/22404986296.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f937.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 16792 bytes
font_01_sfnt_off00011149.bin
ca69310d68312591c768e9dd3e5793fc9bc4dd940f789b03b0b907d8b1b4ac21
pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 17448 bytes
font_02_sfnt_off00013eda.bin
18aade737b22acf8802f06ca388fb50e63e3f56e47b38d3b3ad02c12d4efab7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDA 11212 bytes