Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcc0dd5df2c1880…

MALICIOUS

PDF

99.7 KB Created: 2021-08-21 22:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7959d1f900d8a4beb5f52bc6f2334fb9 SHA-1: c914f3d82d3a90bcba88410a24c4dfc5da10b6ac SHA-256: fdcc0dd5df2c18802782b6fd9d13cd638407b0f973a445934b1e75616b3e447e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 http://lateonsettay-sachs.org/userfiles/file/17999590558.pdf In PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/3vs0vbltcjl0uuou7p19at63s9/98349157340.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/jasajuxofelukolawisiruzis.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/kidudikobusolesujibomizob.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/34318570277.pdfIn PDF document text
    • http://ymmicro.com/files/files/wixepidor.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854cbeda3c9---sewunatodurajexiz.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/22462207720.pdfIn PDF document text
    • http://garderoba.sk/images/_file/bosijuzave.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b55d09f71074e9c8bfc5da86c3e09aab/wixujikibe.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/13160114828.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/66175471373.pdfIn PDF document text
    • http://fxmeat.com/upload/file/e6659b5c43e2840352b1c545c8b13708.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/41495475774.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d618b581d---fezinojetus.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc7566ea89---65082386329.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2abfe9de33fc28bf88a03d0152ba7f1c/giguritowifag.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/gofofimupigupuzikodirifaw.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108422d9e02a---16190264158.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/zipanozanuvi.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608784522f484---getetiriradoxigenazomiviz.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade43a50ef2---22081470636.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/81300594426.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/91878257745.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ada82858b2e---97642825645.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16107dce463bc6---lasifutuviworobururo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=examen+de+sexto+grado+segundo+bimestre+2019PDF 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_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 11332 bytes
SHA-256: 08fd84936097277a65c158e1248e6ffd0d5f627e2c33e0cb1a9cf9a30ffbc430
font_01_sfnt_off00013b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15325 17368 bytes
SHA-256: 74a24b6430ce9a5e56d6d4cb50f25ad2b43d69e9cff72404fade7417bb721d48