Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edab64b93505a8b…

MALICIOUS

PDF

93.5 KB Created: 2021-08-10 00:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c3384cbfea140bfb760561d1de0a8d7 SHA-1: 0b4820bc858eaabeff61910bcf5dd86f87f425aa SHA-256: 5edab64b93505a8b6b28774da6c2a3cc90ac0814344abca278cc8bcbd2d74ef8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to act as a lure or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=best+electronic+gifts+for+7+year+olds PDF link annotation
    • http://agataklimowska.pl/userfiles/file/3929844354.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8cbf27acd---32492501264.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/lijerukexojijasusejijusa.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/21371380095.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/20d1c120bcde0919371198fbe1548ae3/juzevisukavitujokegen.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/e4kriknj0v6do0i8j4edsmgpa7/80062894988.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/78142034076.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/tejunifebage.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e062da1fc9f356c07c04bde697543592/tiroziju.pdfIn PDF document text
    • http://ashioke.com/images/library/File/42988023774.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/bf21c592362d1d3b9dd7397960a222c5/ladujizimunegel.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/64674499929.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/wisut.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/13566254577.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/bolopuwu.pdfIn PDF document text
    • https://aashianarealty.com/file/73412767297.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/72094333141.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/89912291363.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/0da12f70ebf99473fcff2a2698be59c2/31121430505.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/tekolejo.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9a683ceb14fd1bd245c0599d8c43232f/20038903775.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a976359cbfb5bf022f42dc536151b1e4/gelipunewiteluw.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/laxel.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_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 16688 bytes
SHA-256: e923d288e8f5bcb4ddda3acfb74227fa44d3b59fe44942a07f400144e9cde4e0
font_01_sfnt_off0001363d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E54 10868 bytes
SHA-256: 5a731bc88f159fb68c01db88ef0543b73e87e9f1e9544b961c6e825590d259ef

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