Malicious PDF — malware analysis report

Static analysis result for SHA-256 27714017972f43e8…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 18:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6864e5f93cbe80563ed82b3b9d840bc2 SHA-1: 2e31cd148da33ef89139ce3a403c320b47883370 SHA-256: 27714017972f43e88394da175f32e683926513fc9be6153fe3a674757ef65c37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://citronixdeflection.com/nbloom/fckuploads/file/xujuwa.pdf In PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/24492797438.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/vufenurilofamexa.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/vunemuvazolanakegiro.pdfIn PDF document text
    • http://pk.mo/userfiles/file/kabexawaputitewowerimet.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/76906496470.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/129006812.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317118d35d3---zuvijiwotodepuxarefid.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/lawubupukima.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/fopidemisetelud.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091903084380554.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/38009385927.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/36349529391.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/706431717.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161390d813b183---gufaz.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/57400590249.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61584306210.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/pinozuragakir.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/fesiwegek.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/7816602637.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140d46c2e232---18216529343.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/vaniteravegunuladuk.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/sitenisitevupofadovedosu.pdfIn PDF document text
    • https://jagominum.com/contents/files/16164464737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=wgu+email+on+androidPDF 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_off0000b234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4B 10420 bytes
SHA-256: daece79a3fe9f83503f00907e37d6271c24859c27945096ae7c2d6471899a150
font_02_sfnt_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 15044 bytes
SHA-256: df08cffbfead67fbd960b54af09f927bb126253441f164eb455a1db5e7904fb2