Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea34b7ab56a7cdf…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 12:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ecdb5b0b643c21c5c53603b4dfa8d0c7 SHA-1: f07aa1403465259e2217bc22923a14b72cc9898c SHA-256: 3ea34b7ab56a7cdf5bc2ec2a9b6b640ec5230354f0a10ea6d99b41dd2a629c7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://fobh.net/userfiles/files/8212305270.pdf In PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/90581312486.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/rozavekawuba.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/fesupiweletasedulolad.pdfIn PDF document text
    • http://alkanboya.com/files/file///fisifejoxemevasu.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/4664616878.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142fea7e8c2a---42747180273.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/13541697871.pdfIn PDF document text
    • http://carszana.com/image/upload/File/95715886045.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/53860382786.pdfIn PDF document text
    • http://vpsystem.com/files/fck/xudosal.pdfIn PDF document text
    • https://kultmotor.hu/images/files/9000878245.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea79c9e1b9---1065020949.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/27548905266.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/63476063156.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161386f15eae9a---22385334546.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1614110d924a9e---kijogi.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/kojotexub.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/tivamabimuginewusakovoga.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/8184908429.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/50407193148.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/15902302232.pdfIn PDF document text
    • http://www.og2c.com/images/file/89991976505.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/tagevupawubadomeniwejirew.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/89a5ef4b984ce12c7a111971dac9b3a8/26920590603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=atkins+11th+edition+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_off0000cac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC5 10412 bytes
SHA-256: 040029be307d370cdc2a97dcd48fa041101abe9275f80362c9ea4f796f773182
font_01_sfnt_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 18760 bytes
SHA-256: eb9db15ebff0497e25a322313166f25d493ce06ea8a0a9ae75db9319cb59ca24
font_02_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1