Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe2f5e35ee003be…

MALICIOUS

PDF

87.4 KB Created: 2021-07-29 18:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4acca2bcd13984d85a7151ec1b049733 SHA-1: ef1c6435cf7988ce2bee5edb8e29e37400334c5f SHA-256: cfe2f5e35ee003be46a244dc33e4f032160b18caf47445fe12105804b19c32a2
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised websites and disposable domains, suggesting an intent to lure users to malicious content or manipulate search engine results. The presence of multiple compromised CMS upload links indicates a pattern of leveraging vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://intproplaw.com/admin/uploads/file/nonek.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa5ea2c55---kobugumoged.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/vatibeluvuvakagifizufipu.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/63780399529.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/retorasawonirowojubu.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/54677616444.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/xujixuguzeboribesikamitux.pdfIn PDF document text
    • http://sam-global.info/files/file/mejizufofi.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/i4mslgm842mdnherbfseh1lec5/98138574111.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/jj1obefefk3h5bjthcb0sstbfe/janilome.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9187c9fa---vovujimer.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e30d822b44a---lekijilar.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc927fcec---zegopadajanale.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/suwuvogexozafazupel.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc52d618f1a---sidonutizufavedibu.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/60383497813.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/48567562985.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/83014928150.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/68404520696.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d852c4b0f---foranumelukeviwu.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b55da4ceab5---25447656813.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/82688782664.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/vogasovajud.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/f22g1itlpgnvgmjc57p2ee53ng/rafovegogufomukijebijag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+play+as+sadie+adler+in+rdr2PDF 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_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 10696 bytes
SHA-256: 21d361357138e841e384fa76724e7380e76c41d97d45911c45cba6b9977a3ca9
font_01_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 17752 bytes
SHA-256: 553440440e0fc17e8be1e0f923a2850cda19ee1f64c638bc700dfd92488c56cc
font_02_sfnt_off0001380a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1