Malicious PDF — malware analysis report

Static analysis result for SHA-256 02fd516a362798b3…

MALICIOUS

PDF

86.5 KB Created: 2021-07-06 10:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8070d8fde0c76ef825d2bd372af39e16 SHA-1: 3bf23e99cc140c4eb7b9e8be57fa634600c59d2b SHA-256: 02fd516a362798b31ac7fb3d7453f8e55e201d0350afff42dbdb16472d3205a5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, suggesting a phishing or malware distribution scheme. The presence of numerous embedded URLs, many pointing to potentially compromised or malicious domains, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dangkykinhdoanhkiengiang.com/upload/ck/files/vuwamefagosobukukuse.pdf In PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/6848635817.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/36c6e0fe0bd5e6e6200ca7274731c4d2/bubunaf.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6da22169048680cc45124a4e2e89548/pavetixasidibizazapidep.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/fbd22a6dee221379c190358496418930/mebifu.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/k2eern6uj1f1vb62pasrp2uuv0/gesuguzibipaxukexitorab.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/bdf9eb7d33ffc4d2f403f4090ae76756/gesamin.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/6426721128.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/61863614560.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/7af367v9dq0d0lrbja994atems/4182748763.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/35479600562.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958acb242a4---wiraleminekef.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077050fbb6a9---figoragefafize.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/3e65713d695cbee7f1e09ffcd2b58ab1/pobutilaziwofibekesojipe.pdfIn PDF document text
    • https://fallsplat.se/file/32797164864.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79c9a5dedd---jovukutanadeg.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5f8d3dd97---79239678189.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609617571d049---loropegubotigodokiwon.pdfIn PDF document text
    • https://ivanamihic.com//files/laxaduxezuluj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pressure+switch+open+on+furnacePDF 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_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 17100 bytes
SHA-256: b5601ad0ad3c7d600378b84b451f919193fd1f2022a37c3f83da53731e5258c2
font_01_sfnt_off00011c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001349f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 10716 bytes
SHA-256: 2219237a2dc6fa5bda25903d5da36b58524bbb7df12dfc6f4ffc6119e046d48b

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