Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5a2eb2d88f4278…

MALICIOUS

PDF

83.2 KB Created: 2021-07-05 21:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f92c707e2e87a53f9c9710068b1997cf SHA-1: 01f480eb2ea4d989a21a6904e748654e1cf776be SHA-256: ad5a2eb2d88f42783b5d79f17ef04cda58279a8d4178c066ba476afafdff44bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of links, many pointing to compromised WordPress sites using the Formcraft plugin for file uploads. This structure strongly suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a malicious intent to lure users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4017

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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf0205bbe8---lozadiwizoxatuzolakemusi.pdf In PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b30d57e92a---93359896122.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9769ee76---40102509330.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b621ff16807---57851806054.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/matexutawuwe.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/sopawereji.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/cb9856ed5278851b69e07fa265c35f4a/21578019682.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/80999979988.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/51727952637.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d73478c00820743f10e87e3ac1774f5a/pitisan.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b8439cc96a1---71212846449.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/l04637f2ktptg7k7hptn5pfphc/96607400071.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/77244836387.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pebufifisudowifo.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/nawenetu.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/645fa5d1276dc39859dc1447646631fd/xuxavuvupodogutodelajaf.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/9fc68c0203c24cc8a088ee70f33f20bb/26689208443.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f231c3150---zuzopabuwada.pdfIn PDF document text
    • http://unsersohn.ch/images/file/92499510563.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608194517d5ae---mituguvifukow.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/gimib.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/cc66eaab9455e31cf76fd45f551f35b3/80174718226.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33cd8814e---7754969715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=airplane+with+propeller+in+frontPDF link annotation
    • 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_off0000e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 17364 bytes
SHA-256: 9bcc182a85d68b39d0c4666546e62d41732ca416e8e2fc9a54e53294816127e1
font_01_sfnt_off00011615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 10352 bytes
SHA-256: 7f1fa568431a5b19a4bfb3d019b5aafc9bd05352a7e6e903be8966c036942c71
font_02_sfnt_off00012d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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