Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c818f42823cfd7…

MALICIOUS

PDF

90.7 KB Created: 2021-09-01 01:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3e7b2b4820683f77adcdd7cf33c000f6 SHA-1: 4dc5ffd33a506a04cf697617ea634a5993067097 SHA-256: 81c818f42823cfd7dc9ef387ea0a556a20ab287f7c1d355987babf2fcbe0bc1c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to external resources, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential tracking mechanism for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=seamless+transition+pack+free+download PDF link annotation
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af1074e3c9c---64914495887.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16092a2c90faa7---73812246846.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/16170186387.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/54484630001.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/89795213273.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/70029610372.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/42786966405.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c37f56bc834712eae18861abe8a613a7/24494529941.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/61615635334.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/wuravijuluralom.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/71238433090.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/manetixodafovuponog.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/86074691649.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/35935331228.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/2428633351.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1a1f85ad833e8ae09b0c853c695cb2ff/pogimoranovow.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_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 20080 bytes
SHA-256: ec2aa580d0222de77236df164b243d441caf54c75faecf9b3425fb72d2a64346
font_01_sfnt_off00012ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA5 11032 bytes
SHA-256: 47e4cbe5493c2c961d0abcae461b578887e7a81d5b10889a6f24b43d53abe222
font_02_sfnt_off0001454f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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