Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3518415a8941f05…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 09:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c8070fc23dd438e04cbf52e46e151d53 SHA-1: 8de283dbdc6889a3856dccceac3218a6c8a1acbe SHA-256: c3518415a8941f051cfd76ac912e8fa8a2e0840b6c0a3f10893020fa3aed4e49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=aplicativos+mais+uteis+android PDF link annotation
    • https://pepinieramontana.ro/ckfinder/userfiles/files/lifan.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/681539741.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144407139122---xitegilafi.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16312407791137144576.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400c7bc0986---56344777276.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/memomeba.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/duvabolasititiju.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/dodigowiteb.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/povamatevexavufavidafez.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/96795654334.pdfIn PDF document text
    • https://ratoempat.com/contents/files/wizonuk.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/070920265102.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/35397375395.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/28041248197.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb7cb8f55---26447511281.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/18876116996.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/jonemaji.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/51b358ba5fea27942134e13dc1f881f6/rivawadugiga.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/sonugagojimu.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/nosoz.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/6867268822.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3bc49881c---fudigepot.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/robenimudeluxume.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/57574359672.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/96486023458.pdfIn PDF document text
    • 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_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 10824 bytes
SHA-256: d60c823aed65cfb51528d1de90533e7833d892c7890aaa5efb9c90db9b4f0b4e
font_02_sfnt_off0001186a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 20260 bytes
SHA-256: 69e24bba90830d9e73ad8e99a841d146d65f61cc0ca72c8e6f81187965438fe1

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