Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06c5308664e933a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 14:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bfec0aefc41cf3932b0594f5713ab77 SHA-1: b9d3c95bd11e3f3cfb4e04403b612c2d103d10b0 SHA-256: b06c5308664e933a6521dcd41b5278f73b27c4222a996f5e4483e14edf1cee5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised CMS upload directories. The embedded JavaScript likely facilitates the redirection to external URLs, such as the one found at https://pixomot.ru/uplcv?utm_term=beck+self+concept+inventory, which is a common technique for phishing or distributing further malware. The presence of numerous external links, many hosted on what appear to be compromised WordPress sites, reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=beck+self+concept+inventory PDF link annotation
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6eeeb853---punaxosatupot.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/fadezafik.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/58111713002.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/pabad.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/bivapixijipejabiresuxop.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/54476694434.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2960945054.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/balopiparukupemolipakin.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/52782907739.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/dinusidezujasanasawodujak.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16134ad5eb03dc---6954525332.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f729db5fc7---1507393547.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/jitisejutidenawaf.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/bowikusenifat.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/15723530154.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138215943463---zamolobudat.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/11577539468.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/13823113524.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210911045541.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef7a95fa89---57060196950.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xisipebigerivatanavad.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0b36cf79622fead72f8d0332146554f8/nujaborebitojibaxaju.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lph7hjh4vq3gcqb8ak01jgbgm5/tozawa.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/488496064.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_off0000d0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C7 10636 bytes
SHA-256: 36046629419981993f275b978d1e744953d48fcf33dbabb486555dab8582a68f
font_01_sfnt_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 18904 bytes
SHA-256: 306d740d62aea28885cafb14f52d11de6e9c453572fdbbaecdd7b82a6e59d373

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