Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce93587a3f8bc96e…

MALICIOUS

PDF

78.8 KB Created: 2021-09-29 00:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6235a412fa553159ff947d2c1829c7f9 SHA-1: 8dd14b233b7cac1253c700e43457bb8f0edf1cf9 SHA-256: ce93587a3f8bc96e54be6985503818bfbb27190465b274b9dc958ed8307f8a63
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on various domains, many of which are flagged as compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests it's designed to lure users into clicking links that lead to malicious content.

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://holyfamilyhospitals.com/ckfinder/userfiles/files/disoginiletajedetumunidib.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61cf4a3b4---duvodesanorezuno.pdfIn PDF document text
    • http://farashimirooz.com/files/fulumagegifa.pdfIn PDF document text
    • http://esejsc.com/upload/files/nudizudejegoruxomupe.pdfIn PDF document text
    • http://mp-journal.com/media/file/14348977778.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/nivibunubigasimadafavunu.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/25846261515.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/bizowopudevomeruxaba.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210912041003.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/53451357636.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/kiriluputipimokuro.pdfIn PDF document text
    • http://p-energo.ru/content/file/gukubodebo.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210909124532.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/52676187747.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/86864724160.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/diwavunajimugawum.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7929f2137---bonubix.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/39338692768.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210902_23A6CEAED46A1901.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/58893749524.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/60076911515.pdfIn PDF document text
    • https://soechi.net/userfiles/file/6812232586.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/32490624468.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614adc23746dd---78954641860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+1+hack+game+mod+apkPDF 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_off0000c5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 21096 bytes
SHA-256: d5cac05048caef6dbd2aa0ea86dbf92cfcbbc24a1c654452b3c2e8848e90f475
font_02_sfnt_off000114d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D4 10772 bytes
SHA-256: 670df96f1eaf3fe958f0772a5877dad6393dbd6ae3cb7f959adeb1fb5e9dee3c