Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db553259c0c9271…

MALICIOUS

PDF

96.4 KB Created: 2021-07-08 11:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 572da6767cd7a8de2c33093fd97ed3c2 SHA-1: a20072bf254087b8c00b3eadcb2e4f6855a83f0e SHA-256: 8db553259c0c9271bc2d4cf599c8a6036564e0290b2f24b231c3f5033bc4eb36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links indicate an attempt to exploit user trust, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078a87fa15ab---babazesimo.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072b42b3c144---xexuvopaxan.pdf
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/5919d87a2372992085b36942ccbd47d7/83657700632.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/p8vft4hmuhg5mupihps65qktv0/88963161540.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b361ed73a12---bekixelelaninupumojinogub.pdf
    • http://www.hydro-tg.pro/upload/file/13688756976.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/gujotenevuratot.pdf
    • https://leo.tw/upload/ckeditor/files/95938846346.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c58afd34e90---29101165860.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ebce3d405333c57dd8de1b0a69b9cde1/14453749588.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e63e3a01a---ruridusarazatudonuzeti.pdf
    • https://weeb.nu/userfiles/file/ralulopeximoferodanis.pdf
    • https://amatnieks.lv/pictures/image/gajopusekawatujirinupi.pdf
    • https://iwnta.com/userfiles/file/zosas.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160815a6b9ab27---sedonulipinakiliz.pdf
    • http://chandigarhdatarecovery.com/files/file/vemamolafajobigara.pdf
    • http://1975geegees.com/clients/78603/File/93253554743.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d545fb8bd9---saxanusuwareka.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/e505e6722b24f934904272c3ba9cb658/pibejodomidutabav.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071fea151522---70674493788.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607285addb2c7---33349023592.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=freud+social+learning+theory
    • 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_off00011611.bin
449be56ecc0acdd3fc04df8b2876a1a2373694066bd8a9ff266774285e557a45
pdf-font-stream PDF embedded font (sfnt) at offset 0x11611 10840 bytes
font_01_sfnt_off00012ecd.bin
3bbf5341fa65fabc4987707cffc20877f3cd347f0058b062df01da4ce6cd957d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECD 17552 bytes
font_02_sfnt_off00015c5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5C 16792 bytes