Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0756fb37877b85…

MALICIOUS

PDF

105.0 KB Created: 2021-08-11 00:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6beab1390cc959cd33f9beeed45383a SHA-1: d55d76ec8934d8b122daa3600580d87151372062 SHA-256: fd0756fb37877b853e7f9633b75f38ebc887cc49a8f6de7f56d8913b569c5bae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a29ad3e10c1---90980946036.pdf In PDF document text
    • http://alexandraharris.com/clients/36054/File/77754692606.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/turusupapiganoxiri.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16112ea4d45f0a---vugegivurowiwomogipotig.pdfIn PDF document text
    • http://vhz.cz/user-files/45861731531.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/o8tf2f0hbkbihm2mbfr58c62t6/wuwerifojavizepevu.pdfIn PDF document text
    • https://digicpictures.com/downloads/rumonadepuvatowixidorisu.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/kadazuwono.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/86523992795.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161114db0432aa---vomupazepoxisubozopepozex.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3102f559c8f7a9357d0f4faeab36ad3/zolige.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/41133131394.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c17de268ccc---pizowofiwaludezojetegured.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/1c0c4664a27749f55de3ff7692ff3ead/xikubu.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/52487731531.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/57967899329.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077849b00b63---26170259619.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/46577048233.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/lotajajekako.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/koverulubulose.pdfIn PDF document text
    • http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/dazumezebit.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/vuzewowabudavidova.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/f0qh0ju8h194m78cch3a9uso0e/xepaxojofuzoxiwuwif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+apply+for+ehsaas+labour+onlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014772.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14772 31356 bytes
SHA-256: 3020f57059a341ad874322ccfc5615c3f1aa6328108199436bec4389dd50b0d2
font_00_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 16344 bytes
SHA-256: 60345453448fb3ee7266cf63d16807c482a5cee1aadbb1dd4799e1aef9a51411
font_01_sfnt_off00012e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E75 10928 bytes
SHA-256: 50d93d702c3aa5429e747d375e486d33d6beb03d8a54cf1d4170dc054a1ffe41
font_03_sfnt_off00017d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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