Malicious PDF — malware analysis report

Static analysis result for SHA-256 df17bf119817af85…

MALICIOUS

PDF

93.7 KB Created: 2021-07-08 08:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 566b5f3e9757706e1be2acf27b44bc1a SHA-1: 9f69eb6080fd5832ee2ab05a5bcce61a594b93ac SHA-256: df17bf119817af85e82a66854dae1890570268e3b16b60628913555e2853a274
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://temple.mo/userfiles/file/20755083300.pdf In PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/a7o5e195hu06uufecdfo2mk39i/20697383395.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6471r4cb6p5kve5ls5tvgc0se7/42627785702.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/0986c649fe6a741eb509b548012a97b8/66422660237.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fdifktt27hgdcj212hf2hcmhmp/juvuvudibu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/unipasj5o77uelmdc2sff6e3be/26696528625.pdfIn PDF document text
    • http://falerisztika.hu/tmp/87927875699.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d639437c06---nomim.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd51ea3a57---77041500926.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9e103799a50af040260736c3e05363b4/98065478289.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c55c4ca93d5---paruxafufaxofimoxumet.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/80530a87e6f72731b84760ebe8de6824/zorepafixamidebilu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e32461bdff---pebevavopafuwaxosuwetumu.pdfIn PDF document text
    • http://aps-mes.com/files/file/40602330046.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/1204401251.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/224b064bf1735e0b38ef1fc354005451/bonigafavedukus.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/k0top9h7b21vfhnl2ivfms8pq7/69425612432.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2f9828eb4---5694025530.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb85fb6dea---toriwutesegijekunoku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948ced2857e---36433104710.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/56962102385.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13e173470---banozejisusirataka.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/4226164326.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/wovazejuturelezarifadaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=happy+hour+sushi+near+mePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 16392 bytes
SHA-256: e9a704d00dd6e8ff808373eafce3a9164bafc01e3896b7f7a96cfc50231b2c9e
font_01_sfnt_off000108df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 10576 bytes
SHA-256: a08c543cc3063162a2bb261904077d705fdc6cd0b40596a3535761e72e54fafa
font_03_sfnt_off000138db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DB 17860 bytes
SHA-256: 52e7444c26ca2e6296c3d0af512c74a6b64ed8ebb41ba02e7dd3e2f8b029b040