Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ecd7277271c525…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 16:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ccc579f4b934be1c7274b8dddb89d894 SHA-1: 160346ce43188daa24c5b4b03b81784d718c3814 SHA-256: e5ecd7277271c5258fb7f97556e56c2f13cd61e01c6c64f81b835ec85e2ae329
176 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics points to a malicious redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ferest.ro/imagini_ws/wazudarutusej.pdf In PDF document text
    • http://abbeytraining.net/userfiles/file/rilevudugujukukupegowuwa.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/65756812706.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/rotapal.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/93243253958.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443d2ad13fd---vagutabuxekubudefufinox.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614037e8c2eed---39186061756.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/tamapasoripolegaki.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/bimutegedulexup.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ve7g5qe002k1jb8ga9utlnbk4s/32835783535.pdfIn PDF document text
    • http://health-bridge.in/upload/file/ripudaneva.pdfIn PDF document text
    • http://master-br.ru/img/file/revugusiwojanetezali.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/42120731311.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/mebiridasuxofi.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/romesiditar.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/10181135589.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/60550117724.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/38671177112.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/94463933769.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/49219208432.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210916141904.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/kumat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+revert+app+updatePDF 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_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 10320 bytes
SHA-256: 26874ab98ce7aceb76543e2e82a08d36773a67974c31f30178fb629c584bec5e
font_01_sfnt_off0000fe4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 20136 bytes
SHA-256: cdaa20005aaed023f2b86beb83f2e90916862cd98abcb2962eab6ff28561a40a