Malicious PDF — malware analysis report

Static analysis result for SHA-256 e555622b27dfd3c8…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 04:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 90dd1be24a113ec61c9dd44e924b17fc SHA-1: dbeaf2eb91d129592b7e18a5c94e3826f7c7a320 SHA-256: e555622b27dfd3c88054ffb2bca109acc728e3a420bff831c486c61f5f547595
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The embedded URLs, such as 'https://crewmak.ru/uplcv?utm_term=idm+crack+download+for+pc+64+bit', are presented in a way that suggests they are download links for software, a common tactic for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=idm+crack+download+for+pc+64+bit PDF link annotation
    • http://shqinze.net/admin/upimg/file///xivuzejazasatiruxib.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/xudomuwiv.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/27000222769.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109200955401484.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8fbb889cf---jiziwabi.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/56609327217.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/natututafomidavedumunig.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/nobowopopepiwidizafafet.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/84351482111.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/n8jrs4if18431sp00d2icpkp6t/vetuxabil.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/35245351269.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/87015148646.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/nopavenoxuteworiwafave.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142d63a0ac3e---74071695203.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/kerisi.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/20936889779.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/21324174506.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/93215465458.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219162246367007.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615139b6bfb0a---19351733577.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/nofagekajo.pdfIn PDF document text
    • http://knipia.com/userfiles/file/21700696444.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/77343354585.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_off0000b13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 10996 bytes
SHA-256: a40d82a99b5b144fb551179f1736d0d989770ee753071e8e4ca31b698bf9fb6f
font_02_sfnt_off0000e2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 17744 bytes
SHA-256: e2b3e3830c2d39a007f94f30300bd02e8ab6d44461d1ac21ec2effd6f28606e9

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