Malicious PDF — malware analysis report

Static analysis result for SHA-256 615718b3eee4947b…

MALICIOUS

PDF

99.4 KB Created: 2021-08-18 01:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee4233f970fe9b9ead16ea933be243f7 SHA-1: 9ed95f7ffb83c801898a6a8c6d61e124035ed5a3 SHA-256: 615718b3eee4947b1e25ab71f22661580971824359196e41ce37f4d6ee0bcfa1
184 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting and the use of UTM parameters further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=cant+get+through+to+edd+identity+verification PDF link annotation
    • https://majubesar.info/contents//files/sexozemofotewusexaxipab.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/rigowavogari.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/44037126348.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e4d987af8b027326e0acec39bb40c486/12344221379.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970986de08b---wejom.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/juzuxamexitu.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/fegenopemuzeguneviraf.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/t99bbtj0hj8nvtikns1hhdihng/7090473755.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/27559973262.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/d7e61e13792459cbcc841534d4a02f0c/66093064723.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/kokipoz.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/nanivewerus.pdfIn PDF document text
    • https://cecprint.com/images/file/jazesigobaxa.pdfIn PDF document text
    • http://fedoro.ru/upload/file/23130276566.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/30219212830.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac34b8bf66f---58560497132.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/6375066658.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/genivawotibinifosizokoxap.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/697c3f62abeb61b96e926f9ea30a60b0/kupufuxosininixebufuka.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9f56375d1---38662647452.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/561ff7c1f21ccf73f42701d5f05d4425/12511784829.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607167851363f---6686979421.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/667aafc100dd2379ca196cd0b7b1437c/64994917308.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e30694964a6ccab88ae1b21d2792a5a7/bubuzumepalurafimu.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_off000120ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CE 17528 bytes
SHA-256: 1224e467021dd375fe2d4804b2a9af8e03e13c81333be91e43121be555cb85ea
font_01_sfnt_off00014ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC3 10852 bytes
SHA-256: 5771a89ae7ab8600688db0c2c7dc3c6551d88a08765a6df3a5a6bcbdef46ffb0
font_02_sfnt_off000167a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1