Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d8fb0ea54ffdb9…

MALICIOUS

PDF

76.5 KB Created: 2021-09-10 11:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc8104cc70ae66fb29185d004086155a SHA-1: 1e61d9866a1a1c85955e198ac799fecba3d4ab44 SHA-256: e0d8fb0ea54ffdb9bc15a04b5d523f52a4e09e8abc13bea9783561fc176d6bf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=how+to+download+psp+games+in+mobile PDF link annotation
    • http://vit-physio.de/file/68725624605.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b6fa55068---pinujabod.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/12502102264.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/92972479291.pdfIn PDF document text
    • http://watch62.ru/files/files/digosibubugomopezudotafa.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/nepotetimufezefadosolu.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/79345873835.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/2172305775.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f640d0beba---83867323339.pdfIn PDF document text
    • http://twilaw.com/files/files/52118945282.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/27438239247.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161310eef8f445---35145995860.pdfIn PDF document text
    • http://acril.ru/ufiles/files/bodupireb.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631034932_1.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/junizidagi.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/62896549030.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/lajedoviramimujapomim.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/serezemobokapu.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/lakebejipan.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/wepolagajoruxomo.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/vetonipafenofiruwo.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/1333353898.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_off0000c667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 17608 bytes
SHA-256: d5bc90a8c7c6be9833d960e6a41f9dd88a8581f4a142c9cb0ea0ff4e88e33360
font_02_sfnt_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 10852 bytes
SHA-256: bf1fa533b81fbc17ea2f9b2c6c10e023d6498dbdc405a63a6fa78427e7d25725