Malicious PDF — malware analysis report

Static analysis result for SHA-256 60518a8d166ea8f7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 01:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0620331092c143ea4ccf482d71af7010 SHA-1: a8d7c4226e331a3a3a99ff17e903b1fcab5188e7 SHA-256: 60518a8d166ea8f7de303467307fd08652148feb29e7f7a036249e21af0e3389
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=would+rather+prefer+exercises+pdf PDF link annotation
    • http://shethof.ch/cgi-bin/dynamisch/file/34270441171.pdfIn PDF document text
    • http://yuhongzg.com/d/files/zuzote.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e36a65be8---zanugufijanomopux.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/4hs9sb08ea6ihk62u3agonlg8a/bopexonosodofibinat.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/o713drkitfh4sga4hbdao0ggtm/vasak.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe815b7a1d---97400066584.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/kosefek.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/61870098970.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160935935c6a60---66003799062.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610417786c44b---85054515890.pdfIn PDF document text
    • https://hoongnau.com/upload/files/josevukikudazupipab.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/37011582223.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/88062717432.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/248075e17676ad19c4083f9c0d7e8674/robuzutolivekem.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/83008010690.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4afc29f25---37097622756.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea5e5d23a0---96068804740.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab16adc392---262938769.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/nofikunogilipexulesibipi.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/kewoz.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/tasuva.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/c93d5aab36a9eb9d5db42fad05abf5e2/75233699927.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/20276022954.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/zedawo.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/waxibajozunabanu.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_off0000e014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 18436 bytes
SHA-256: 098560968554df92a181c22b2deead3645eb5a0563ab5835237317b5264387bd
font_01_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12801 10808 bytes
SHA-256: 1f2b929af5fdbd0f389e2cd4670e4abc0b43c86b309ab62900cfb557217b7a2e

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