Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c999aa3a25029e…

MALICIOUS

PDF

96.8 KB Created: 2021-07-17 12:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7bae13471460532fa0ab32930f654be1 SHA-1: 4e40e7050b6033846a029ace083b93f25b1643be SHA-256: b5c999aa3a25029ec9d7e1fed88c189daabcfc3a9beca884a0010322d4c4f824
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure malicious destinations. Although no scripts were explicitly extracted, the nature of the links and the PDF format suggest potential exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/hjnpgls4si5f3rgok0bgccrt66/zedejifumukedumij.pdf In PDF document text
    • http://minerva-collection.net/files/files/78175705555.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d358b048c9---25365046180.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160945155d65df---fowulositideferujiwuxegow.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/1898725241.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/fakakomamigigitubotazomag.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/99625370073.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/37654532176.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70322111164.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f9d024161e624a5a522a566c00e72b6a/ranimodefe.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/gizexizumemexovigu.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/30984884169.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/gadirezotuwom.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/70181168389.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609723a4b2209---minenubiledul.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/dcadd4d2838477b96f0de195a88d8c35/90860689166.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/borata.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9752bb3ea9---97913123688.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/34c7a3e2b2086ae127acef6c894266fd/jixufuxunumiperawob.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6b8a47457eaa46c2888deb4fa905cd8a/wukonavuvusixak.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/tum43fvsc76ehb3b2ksjhf10e0/28100002047.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/dalawoginubot.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/7506404540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=school+office+manager+interview+questions+and+answersPDF 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_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB7 17548 bytes
SHA-256: 34d71dc2f00206efd608908bfe629d63d2bd00fa93ea7c8e8c6b49b0b4cdddcf
font_02_sfnt_off00015b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B75 11396 bytes
SHA-256: 94ca59b1f85c6e378960e93c7f7dda67650287e77a54924a4fe257b97f06bb71

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