Malicious PDF — malware analysis report

Static analysis result for SHA-256 970a742740d13a39…

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 01:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c916957b1dcdb173854ad06b4c8523d SHA-1: 33bb4a135a34708063db355e0bdffc1e419f39ed SHA-256: 970a742740d13a391e40f5129c7b00ad7cb0db689f03e44abc4aafc4a1e2efd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories. The PDF itself contains obfuscated content, but the primary function appears to be redirecting users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://satybharat.com/ci/userfiles/files/suresarusojujivup.pdf In PDF document text
    • http://northmarking.com/userfiles/files/23317654061.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/2003f9c7234c573ec0e1350bd485d836/xopesudazazuner.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/30595211705.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/6200056619.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109161642273968.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/nawuvukix.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161304a589879a---34397353194.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143587df26d8---72106976298.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2027673420a81fbfd337da0bd28b7b07/vinojuregizawunukoxevoson.pdfIn PDF document text
    • https://polaria.cz/images/file/xotajepuloworatisivimifon.pdfIn PDF document text
    • https://invision.buzyhub.com/files/nukakikilumurewevizos.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/mezovux.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/rijurivumoxete.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/54737926843.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/ximabilegujegegowa.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/rapanarobezavopegixozogu.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/48273044428.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210911002855_kzgy14.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/neramubujawawo.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/49020234078.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/balunuloze.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/64606766524.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143bfdfcf68b---dawowasugegod.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/gotuladipixumubagelo.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/dabodibabusoparuwiruvomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sniper+x+with+jason+statham+mod+apkPDF 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_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 19632 bytes
SHA-256: 066a5b92c97bf27faec276094a2b40ddb8c50d58ade7f56564f75bb46cb563c6
font_01_sfnt_off000115fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E12 11096 bytes
SHA-256: 9ef0fc6e1b8064edd4d3ee575775025e1a613b433e204af91df11d4e58753eea