Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3915830b47beef…

MALICIOUS

PDF

78.7 KB Created: 2021-07-17 19:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28f812dd7b1219383c80dec9f716a6dd SHA-1: 7aae20f101ff64a85c8d0996c6010648dc1e745e SHA-256: 5e3915830b47beef890f1850dbe079cfefe690b15fba8db34de9885acd14b931
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The presence of numerous links, including one hosted on a compromised CMS upload directory, suggests an attempt to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/82642619880.pdf
    • http://iproperty.ae/userfiles/file/tenezijigabatametenegew.pdf
    • http://legalinet.eu/userfiles/files/21086765217.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7c4c1ec53---81803458669.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/udamr66appoa7kkt4mj4jpk60c/fuwasobekowedekegutulabo.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0303b769---kunetudusa.pdf
    • http://inspirationforexcellence.com/clients/66491/File/47769850604.pdf
    • https://mmszke.hu/files/file/negiresub.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a199d7d8---wugarazipakiwazitabitiju.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/1tajua38b81p0hhp2fpru06src/mibojimamew.pdf
    • https://deniz-sogutma.org/img/userfiles/file/71248361762.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4dbb192df---buzulezijutomafalonuwa.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c5081526---mofirumilukuvafagixovoli.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e60f8774a---nudetiterenajuwoxatuwe.pdf
    • https://secolink.sk/userfiles/file/98616459558.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f5b015a016ac4527e92bb782a0e1dd2b/mefak.pdf
    • https://le27.fr/docs/file/wexajunu.pdf
    • http://ekbdrive.ru/ckfinder/userfiles/files/51293123427.pdf
    • http://cichanski.com/Upload/file/rirujomivoboxawonukufowo.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e294e3f9---tofinakomesobivifi.pdf
    • https://accidentmatters.com/ckfinder/userfiles/files/jaragajabujajisomajawin.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef63868536---35499055335.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd5c6d843---jekubovitafivowubatuzis.pdf
    • http://alemotta.com/resources/original/file/67607200044.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/6jqmlk2a7p41e9eid1k7u2nqtj/54362796891.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=physical+and+chemical+changes+and+properties+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d16c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 16792 bytes
font_01_sfnt_off0000e97e.bin
da101f1a12373740bde76ebdde14a81eedc6c677f1a16f1d8d3b5882dcaf38fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 16172 bytes
font_02_sfnt_off00011327.bin
bc5449440e7ae5e910e1b1f83863c85b6d57d42ea1186a51848e432937513721
pdf-font-stream PDF embedded font (sfnt) at offset 0x11327 11252 bytes