Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d2b9a3e0f4caf1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 05:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed2d04e23277e2434f7195a0a25d28bb SHA-1: 2b80bd2280ab8b0eb07f22c679bededf1c2786ca SHA-256: 18d2b9a3e0f4caf1ee44ba0b4fc90f89668b31ad545d26f27d8fc3893bb89650
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous external URIs and links to compromised CMS upload storage, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pixomot.ru/uplcv?utm_term=stone+age+timeline+pdf PDF link annotation
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8cf420eaa16de92ec0ed866e853fb60b/34027588476.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca7cc7a0a6---kewudizuleruxalupudaviv.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/xumamogikuginuv.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/76070129245.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/28576391449.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/42335536699.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/remaxizonido.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/3720376445.pdfIn PDF document text
    • http://strahyi.ru/images/file/80671886948.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c2566b24a---fetiwadavojalisasitawo.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/wotebuzujofidinabufejun.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ac529eea4e457d89a715d57ae94095b9/perugijizinezujikizew.pdfIn PDF document text
    • https://scalping.ir/data/files/file/25184583747.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210623170531.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aca8a73b741---47102223048.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0a6b297bf8415dd916153e08a4f77f1c/mukolinujes.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/rajubejodakogenemeli.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/25752702523.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/23ef55924f5f4e850dc611fc9a7bea45/70880594594.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/79179869364.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160726456a15d6---gelufesudelasipamiziru.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/fusasufimopojeneja.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/439b854aae46a272bc81b8337b39dff1/81772909093.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/lidikifezerit.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996040d8700---87562701248.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_off0000d579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD579 17624 bytes
SHA-256: ea2fe331645e8af053a3f6e8c701cb58bfaa2fe06d0b409afc7c4c09cc713d08
font_01_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 10648 bytes
SHA-256: 8034ca2d5df3c466a2deac348394e9441937c973fa5d989ca728bd16271017d0

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