Malicious PDF — malware analysis report

Static analysis result for SHA-256 044a792e6a007b45…

MALICIOUS

PDF

90.5 KB Created: 2021-08-06 22:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 875a8b3ae9e745c65057085e96aa19bf SHA-1: 4e7146567ea14bfe32bf940a07f77d50867e8161 SHA-256: 044a792e6a007b456e48628201562bed7a70c45f411464113379b60bdc96f29c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://benthanhsgfarm.net/images/uploads/files/36427828893.pdf In PDF document text
    • https://aaaxxion.info/images/file/petepamowiriwelogot.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160805d56c4b29---47478857994.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/josejo.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/e0h70gf8034juvmr4c7rn2jn7v/rivofalegowizomenepikuf.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b411fef804---voxevesevoxejubor.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/xutusabuvigivadefijano.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846305dfb99---36882684900.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210704_68DDD6B7A2138987.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b715e653d7d530d05f9007883269d4b9/sematubo.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2aaade51a---50779444197.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c11cfd0d314---70697157347.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cce51a296e4---47703420671.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/35196597112.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/51607981401.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a45171e0cc7---38007500880.pdfIn PDF document text
    • https://amgaa.org/temp//files/gefixefuv.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3686b0580e---63537042998.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc17cc36d---xejetisijegawagita.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/wixata.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/tawopidasobusuwuwenek.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d4d9c9782b90b20c3241384112716b05/wararoxozesosivo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ff3bc7bd2bf---78276256773.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/namubupejima.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abf570e314d---gepupaxutewekaf.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/vatakifavidubukogugiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=charter+spectrum+ref+code+s0500PDF link annotation
    • 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_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11799 16776 bytes
SHA-256: 95a3685533830b35f39835546e1e045560095392c36658058a1993e960368ca4
font_02_sfnt_off00014303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14303 11032 bytes
SHA-256: df88bf3028de650acec76ed1f23e24990162f493cb2616647c5ceafac24c78f9