Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ff5c6f23ec7a32…

MALICIOUS

PDF

87.8 KB Created: 2021-07-01 19:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8e2e657eaedce6da6f5f1789679210f0 SHA-1: b9b779425aadfffb61b55b548fc2ca2c64550230 SHA-256: f9ff5c6f23ec7a32c2a7e3ef14148dbec57ebdf7f2494af42067363204987074
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, forming a link farm. These links likely serve to redirect users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=steel+structure+notes+pdf PDF link annotation
    • http://chromoink.com/updates/file/fifapabawi.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b742bd1b4f3---fulowewilunus.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ljjqjj5mtinij4bj1q83b6ldpi/fasilifeto.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b755978044---pasoduguxo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b5bec039fe73d86d0c4aaedc7549a5bb/18905694852.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/93749059229.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/gedajuzelabifezi.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81f5bdbb9---86298295883.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/81367529509.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ca18469ba---54583546464.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081d358369c0---86029359133.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/20315599922.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/53099119548.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/jiduxotunad.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/89ec91737d70281162ac5ef935281574/kusosugibumilija.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4ae61ac7746c86203938ec85b37724c6/natuxapebof.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/mokilarivezokefifaxusoro.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/41539798834.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16090771dedb40---35193562120.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6202b125d---valedudazowibo.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac812cbf3e---bizeketifinilodox.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71a63cf01---89565978899.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/20303179279.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_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 10532 bytes
SHA-256: 8cc7b28102f92c40f98f95d8ea562c5f859584132f647721fe6049920d7d9346
font_01_sfnt_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 17976 bytes
SHA-256: 24de4893392ed076133f8cf02d6eb34a56b0778194b8cd57a627629e1128a9aa
font_02_sfnt_off000139ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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