Malicious PDF — malware analysis report

Static analysis result for SHA-256 7937756f340aa3e9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 17:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27dd1f71b38938c75eb606b186a68f31 SHA-1: 068bf51d4dc0124e3d74eeb0e2a0967d5cb25853 SHA-256: 7937756f340aa3e9eeb1da57a9ca128ea657d8a9329326f9d5b763d7d7b2c96f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external links indicates an attempt to redirect the user to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://catamma.ru/uplcv?utm_term=apk+program+for+pc PDF link annotation
    • http://around-sicily.net/userfiles/file/dixupufodefawesonug.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/52582804857.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d157e8bbc9d000ad267ab1f46ff0a773/24210300369.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/13526040592.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/44657566270.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/zitelawaz.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/fefijokesuxupod.pdfIn PDF document text
    • http://aimic.com/userfiles/file/19886354290.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/32053020554.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/fedumu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e463a12cdca46670147c67143b448595/guxikulajoletekexodux.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3e27fa5b5c2e2cdb50e0528d5f00ff54/84524042385.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/zulerexujesametavunejet.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/12883530196.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/kanonejagas.pdfIn PDF document text
    • http://mylodge-naoshima.com/lesoradojuwujejateketatan.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/jonatimude.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/kqbu44re7iijaom7cb03kun5jm/jixefobove.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e963f51f6f28351711570abb97f0c7d8/7913768160.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/06f895c9142026fb760812194ba6372a/dirukiwegurado.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/kulufasogafevapusutadipix.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/54404918496.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_off0000dc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC34 18264 bytes
SHA-256: 5d4e0d82ff8f67c272b2c4010513b151376af54b7ab3ef0cc1dfddcc008fbf36
font_01_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 10256 bytes
SHA-256: dcde56ed40551a0704ce35ffba1ae71dfbfcd7fc891f4a491068b61add339ba5
font_02_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1