Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca88a1e3cdca9d4…

MALICIOUS

PDF

71.1 KB Created: 2021-09-08 07:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 014cd1788c71756b0ae478f8c2ba7977 SHA-1: d6f294d79bd9d057392d53edbcda4def3cba2222 SHA-256: 4ca88a1e3cdca9d4d6efdf97d50301ee4e36c02e4c788f1bce7f48dbed3f2c3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://nedimgame.net/calisma2/files/uploads/49274008890.pdf In PDF document text
    • http://challendor.com/fckeditor/upload/file/48886743126.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/3702741473.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210829181122.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/10923382649.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/gefufojodozena.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/17919123693.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/v5dr8rc1nfjnuoquj3ura6h6vv/subewuwazevax.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/jusigikefe.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/pusopojofe.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/xazebuwedanuvizevadoribar.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/931d6d7b49ead7aa84e08f2e78417524/dovewedipana.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/65484950940.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/pajigononamuvosobabu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fe24hmfuqr6kphh2g9jvbdbgp0/befemodutoganit.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/kiritafeziwepajum.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/kazufudiduz.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/18560897770.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160890e3558357---85184075950.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/95793131107.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe12afe28---66162000520.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/47308452402.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/dalobunimewirukevota.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/damowapimajikivowukoj.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/pidesetaradanibowunipew.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607368dcc961a---fazasosan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hdfc+life+click+2+invest+-+ulip+pdfPDF 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_off0000b855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB855 10636 bytes
SHA-256: d61604499467fd3697e7736742163d060e8f985598154b0ffdb0a5a940c36690
font_01_sfnt_off0000d0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 14940 bytes
SHA-256: 6e6629c44af7137a74e37341bf641163af638c1cea567cbe1afa76fbcae144ed

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