Malicious PDF — malware analysis report

Static analysis result for SHA-256 91939eaac0131809…

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 16:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98cf4e13561f67986ae67fd87868700e SHA-1: 1f6fb2ac109a33ce1b92c1e757013dca5fb630f7 SHA-256: 91939eaac01318094cd4ba549ccac450f715d0f34f46eb8af434b608d05b2f2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, specifically targeting WordPress installations. These URLs are likely used to host further malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd31623e83---zilagadunowukenofujiwi.pdf In PDF document text
    • http://ausafe.net/images/art/files/minelifetoveripedoxobipil.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075fee19752f---zinitonimubufexebitarokor.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94efa86be---66080912830.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094a316c20bd---69553232239.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e355d85e34---33938920627.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/h09oofnqr87res1q64a5avlkmg/fasobazij.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/30768462924.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caa6b3ed7c---70976886827.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-8/file/faponavasagewusug.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/bizelasulitakav.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609876420d519---3851671279.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/ludavotajo.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/fusesuvoravotefuvulibigo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ql19903v5ir83av4v81if3sdg6/weferejumatu.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/3238746436.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/demuwasupatik.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/67678296606.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b42abcdf389---pujekevusimejerebo.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/64843963022.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/nilijediwefi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0205313f---noleberosowosulogenom.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1626171184.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/62003564424.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/kujug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kitab+kuning+bahasa+melayu+pdfPDF 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_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 11164 bytes
SHA-256: bd17c0d9bdaeda5d8b86cdce8328ab3646549f0634b2be7ed38be98228263ff1
font_01_sfnt_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDE 17908 bytes
SHA-256: 7acfd9a6499c18a99f0f6bca2b4e82fc157934c888fd8a699e73bb8ec067db73