Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e14e461451d910d…

MALICIOUS

PDF

82.1 KB Created: 2021-07-05 23:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 611e2b8a440b788dd31faf8819ccd719 SHA-1: 340b71247848ed9e468d77d3571f297dd19de8df SHA-256: 5e14e461451d910dfe36c0156ea0261c9805ad2cf92432e974829e735064dcd0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the structure and URL findings suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allnatureint.com/userfiles/file/91778736811.pdf
    • http://ventilatoryzlin.cz/images/file/64583068300.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/v83181ka6k6keage50pq806699/50737842399.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4185d986de---58342895089.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9d31b224d---debexotefodib.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160886f1ec2e42---90123266276.pdf
    • http://auto-spec.ca/fck/file/5965398498.pdf
    • http://thuduchouse.vn/pics/file/38495670017.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883a3dcb61c---4365035957.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ornfb3hobinc3jc3m4qqcc2vto/feferiwinutevon.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/rskhv4q42h0rsnq4g774ebccfb/xikerig.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715825546a2---zusibu.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c57d7101ece---napubawuzoduluku.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a081a9a8aea---jipowat.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/cudjd16jg0kotk2ur0mb2s2n55/34883680505.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073216667789---jixuji.pdf
    • http://mppscstudy.com/admin/usercontent/file/tizaruniluwakunopeli.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/016e9c2e0a3a65770b401acbe0a19bd2/bulamedolisetasosegupu.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/scun3045aji5e6q5bo00cdcq5u/nafuxutilusi.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e9b888a6---61915487252.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7dfdf4ea4bd453ec91bce7deef92bcdd/fujel.pdf
    • https://weddingitaly.jp/images/file/pilofufaxipafagod.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5c40398b---gorevuzibaviwugufij.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ddccf185---23957842302.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=severe+pain+after+pulpectomy
    • 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_off0000dc29.bin
8fca2f199c044bf5ff89b2fd0adbaa59dbd781a0688f2ec17b5939d21eb5d06f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 17504 bytes
font_01_sfnt_off00010a2d.bin
13dd4d9271befe496d232455c31ea55703d31922e639c5d11811e9b86cb4f69b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 10828 bytes
font_02_sfnt_off00012339.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12339 16792 bytes