Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e038eb790434366…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 12:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec833b596bbffc424ce527b3a1867110 SHA-1: e08d54afe01124e378d9e03965128dec60232cfc SHA-256: 7e038eb790434366073104e46a5e73baac7fa7cb895e5b1c657fdff333d9db41
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pcserviszlin.cz/ckfinder/userfiles/files/ruvukipireb.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6813c8ec8c---58846216871.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/walujaxojizumeso.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/bolapixele.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9572d8fe7---gijugubavusud.pdfIn PDF document text
    • http://surtek.biz/image/files/20150305_051052.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/zugulifivufak.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b95e16c1b5ce0a08a288f38d6c9f7e8d/70000689678.pdfIn PDF document text
    • http://jump360.co/upload/files/20210623163415.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16118b755ae72e---pudonanewoxabevot.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/82436633917.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/350984016610ff4606b65b.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b277190487d---90422239042.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/tasusotunare.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/57043665481.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/qivou1ais9po09r4l3uv35000o/87138076803.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9a3967f8c---42981980108.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/paremevaperado.pdfIn PDF document text
    • http://www.edgartownschool.org/uploads/files/fofekumunemijiwabaz.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/09fbe9f9573aa8dbcc0ad26493a7d5cd/lofafisusugamakinaxefatag.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/nafozanijomo.pdfIn PDF document text
    • http://sowitech.vn/upload/files/lijag.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/zeminugutapofovelesu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4971f0ef7d819a86e2130bf423ff8d19/96709926778.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/jolezurenim.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rixuleso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=g+shock+atomic+solar+watch+manualPDF 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_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 17824 bytes
SHA-256: 8d6283e8cf66d48035345d776386366d9f2e668311221caad61c9e781dc42562
font_02_sfnt_off00011fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDD 10680 bytes
SHA-256: d9397233917e15e1873d407e46a6c8e7a9692ececd1f74d92bd5060f079da46d

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