Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a869d8b8bc46484…

MALICIOUS

PDF

71.8 KB Created: 2021-09-17 19:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16b68080ec72bb43314e81faedb31ee9 SHA-1: b78e8116e4fcb3a37b49d243e82d64ecb8ab82d0 SHA-256: 5a869d8b8bc46484004eb2e56dae712dd16c9b682e9b769e86ee07590cdb8a7d
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

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://peintures-descours.fr/fichier/files/22091955329.pdf In PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/42022336740.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/jowuretimimamiluwiz.pdfIn PDF document text
    • https://educhina.mn/editor/files/67167579081.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/3957206279.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612fee7c90322---83627301360.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/54262799398.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/66354440138.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/76799511120.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/gifuxodesaxoxigukedo.pdfIn PDF document text
    • http://charontrade.hu/data/file/ragofiwakotuzogixasoritud.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/97229949398.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/51394419972.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/98802006695.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/66842211542.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a28655bbde05e76e502167dfede1bb8b/53915989842.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/bazojaxozumumijaletolosa.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cf8d084f1---luvakipenukidizetanebo.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/23175184449.pdfIn PDF document text
    • http://fivelscope.net/fckimages/judigokipepidarelanefa.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/disapuga.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/25058935509.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/89096938703.pdfIn PDF document text
    • http://gr-chem.com/upload/files/xuxajoraledozupegekova.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6k4r0712q0orclul332j2bmc93/rubexafitatelovifigemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+silver+gamesharkPDF 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_off0000b63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63C 16844 bytes
SHA-256: d1ff2f3a737aac48708042d203efb69092d92de64c11b6629585b08c2ae2ef45
font_01_sfnt_off0000e10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 10616 bytes
SHA-256: 9e7494baca5ec1dd014eb99dbb7d2a2f47f1d8ae110cec1261b802c3db32c66e
font_02_sfnt_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1