Malicious PDF — malware analysis report

Static analysis result for SHA-256 506d7e68c92779f8…

MALICIOUS

PDF

89.7 KB Created: 2021-06-30 19:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0dd1f006c2c3e1926f7ab51cbd2bc8e8 SHA-1: 34729de1366741706cc13c3f2501dace3c9c44b7 SHA-256: 506d7e68c92779f8f263dbb257234cc7e6c69f1e90de1bd522c2aff2a1c8a2e1
176 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress upload storage and other disposable hosting sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the nature of the links and the PDF structure suggest it may exploit PDF vulnerabilities or lead to further stages executed via JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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.
  • 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://pozitron-s.ru/userfiles/file/buwifefede.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c37f4d168---88075428291.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/sidojodatawibukew.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba97e899fd---64373770297.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ikk3333630akeeng4t9bppnf90/19351176243.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19d2bce169---19579833109.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/6116693223.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/2d6dc3b623cea9e3831af385ef724dc8/zuzavimirof.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/4600693d1e87580134393db6e4add51a/mifewaxalewuvunonebafede.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/7775764065.pdfIn PDF document text
    • http://newo.ru/files/files/90905088996.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7b10df43a---daxupazif.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/64736560266.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c91b333ea5b39e106bf897e4c96507dd/vubotu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1013d159c9ef58573c0aa08a768f56de/midebosofidizalol.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tnvh5ki1miuav9kct473mr0951/56466422755.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85536862325.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/pubodesafidiveperukixati.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/lumomuxikanofesinujedot.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/84880755157.pdfIn PDF document text
    • http://roocenter.ru/upload/file/33233414054.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/28742097998.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/fiwijerejinun.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/6b09d10419479c83941d318b5fc4bd5b/nanopudodevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=animate+cc+2017+downloadPDF 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_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10386 10676 bytes
SHA-256: 38b1f725af2ac6bc0b3fa7528bf319296274589ca003f4b39a369987e84bc3a2
font_02_sfnt_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 29440 bytes
SHA-256: 7b8ae04e0d45055c64cc067e263ff0ef8592f1fc53806bcdbd114e728b42db50

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