Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2a210526f32a47…

MALICIOUS

PDF

87.9 KB Created: 2021-07-21 01:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f5ede30fef3e37b5e7f90a412e9178d0 SHA-1: b8555bee5971ee2e51f23257a297d12db8efc19a SHA-256: df2a210526f32a47e65bcebcc0924aaa25864a2ec73b5cee48f6dd182a8c3799
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The 'SE_CLICKFIX' heuristic indicates the document likely attempts to trick the user into executing a command, a common social engineering tactic. ClamAV detection and ML classification confirm the malicious nature of the file, suggesting it's a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://vin-baietii.ro/ckfinder/userfiles/files/40673521949.pdf In PDF document text
    • http://yishiweb.com/upfiles/files/20210707_174906.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/tipopeninovabif.pdfIn PDF document text
    • http://chayka-svg.ru/files/8109351041.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b36ac73a24239b84d01cd3110afe1a93/muvubidutodomelepawizib.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/70860249449.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/26818231913.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2de3a7b31c24e04b372e4de9a2764717/taborojafa.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4cb50a13d---29613567390.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/b8aa4b7cf028158d10d930279eebd5e1/94752996716.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/notafutuker.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/bolini.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/74382800387.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084381682b6f---45426807660.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/72089561963.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210617011310189.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094423073f0a---19080380430.pdfIn PDF document text
    • http://bwawarszawa.pl/upload/file/xoxenibisuxo.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd74b9cbe5a---tegejagiparuxubelituz.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160874ccf5f747---86268612399.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/408736a473a6553ae6edd36524480d3e/3424029864.pdfIn PDF document text
    • https://proxus.nl/file/denopuxageverekejoza.pdfIn PDF document text
    • https://apizf.org/public/file/77896322408.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072afa1a2db2---xoxedariberedimatekegewux.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/06e0b5e34bc1ddcf588c9c228fab73dd/napagolufukosufuluwenuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+security+database+does+not+have+computer+account+for+this+workstation+trust+relationshipPDF 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_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 11448 bytes
SHA-256: a0ea482cabbe9b6b0805b2f34bd04f8287a2584d39b2a55568eedfade4afedba
font_02_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 18416 bytes
SHA-256: 5cdd25673202f397b6b63659a6847f7dbf2b4ad30487dc760f32162f6e13a652

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