Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4cd6d8e50a99a3…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 22:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9863fc479154827b1cf68685ddfae580 SHA-1: 70e0a84e0856e07846f1b8972ae162b7b2194a6c SHA-256: 9f4cd6d8e50a99a35881c52d540233ee7238a414c28f1acead97cf24b749b657
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farms hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The PDF structure itself is also noted as a link farm on disposable hosting, further indicating a malicious intent to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://queure.ru/uplcv?utm_term=tablettes+android+applications PDF link annotation
    • http://technocom.pl/editor/file/dowesim.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/75230309285.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ea051376---vawemoli.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5817495f---gelevadokazulitoresu.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/tinepukipazumu.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/63947514545.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/vafovivorunelolotolud.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161314b0829bbc---davuxetakeduwukowiwid.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/figake.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138318f41fa5---47931850685.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/j85vfpqakrf1igi424o60egokp/fenizimemufifi.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/69820821478.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/8c35de9fca8e9ce8c286b09b8c18e77c/5757092974.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/40011050947.pdfIn PDF document text
    • https://ebooksweb.net/files/file/65105707589.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/wisapagipilapujubizitex.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/42353250288.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08dc713cd---nurenibitazero.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/simoveveveteposesoruziri.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pafegavamatexafimobametul.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/jebenuboxanaxuxozi.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a51f618149---51878231588.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/waziwowifonox.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/revozejako.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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 18696 bytes
SHA-256: a7e42f180ea7d89ccc5d7c33f2830914251e07532792f8744500331e09a7da5f
font_01_sfnt_off00010eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12701 10612 bytes
SHA-256: ab22943e687770aea5f31c19a3cac9ccadd87a3378d0f37a9bedf470d1751efa

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