Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ae5e42c41391df…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 19:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 88605e9e472d18c2e2f87568fe1e0f50 SHA-1: 0ad6e8735636d28d3fdd6838159bf4c666a49ef6 SHA-256: 88ae5e42c41391df8dcd863f460e032bd5a22600a80281d65ebfd4313fff0fee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of an attempt to redirect users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615043ca8b6bd---netok.pdf In PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/68767104436.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bef640d1d---nakajubeg.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/91554891276.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/rutisagaxeseb.pdfIn PDF document text
    • https://tch.lu/files/files/31694145159.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/19278713214.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/kowotexowupuw.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/rinejagamopubisoxupetukuv.pdfIn PDF document text
    • https://casaalu.com/luutru/files/40706644797.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161514f71267b5---xenakapafenuvigejidab.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109261544451739.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/powizaradidifurorefamew.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/18635654680.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39643772065.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/wedinizubuxeb.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6de5693d2---24368733611.pdfIn PDF document text
    • http://babamoleskine.com/files/file/bafukolodepudedoxu.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/varuteporoza.pdfIn PDF document text
    • http://cy2hand.com/userfiles/divopetofuxogiw.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/miruvaza.pdfIn PDF document text
    • http://eoffice.erdenet.mn/asu/editor/files/gijemi.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/kokup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=raymond+carver+what+we+talk+about+pdfPDF 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_off0000b327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3E 11268 bytes
SHA-256: e1c77a943b31f0a422a7affaf7a9e76154e2a600e3260debfb61822da731c83e
font_02_sfnt_off0000e559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 15596 bytes
SHA-256: d4e7c9c8cedc35ca9c6869f9c02c2885e3b16157c905a6304a304f9ada25199d