Malicious PDF — malware analysis report

Static analysis result for SHA-256 b135f05eee57e58e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 23:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6cee0816e3500845d1bb493d20a7b59d SHA-1: 6e7858f4df7e4508c6385ddc808e5e8c45d2b654 SHA-256: b135f05eee57e58e806ff5948d93865b26779ddcb212a4520b9ac161d61954fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs and link farms pointing to potentially compromised websites or disposable hosting, suggesting a phishing or SEO manipulation scheme. The presence of external URI links and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=how+to+change+gps+location+on+android PDF link annotation
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/4108103844.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0a92d5820---43530667551.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/rirovenefuvezi.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/repudebo.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/tufuru.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba5e93e040---xapapawemibamezojata.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/gisikewinupipebolazibiv.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/buwaliwisusogivew.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/964e79c4dc3c09392a4377758af5c78e/pikufazifelezes.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/50223099711.pdfIn PDF document text
    • http://c-six.it/userfiles/files/wapifarosuju.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/nexuwemevuwegonu.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/17962635712.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e66eebb09fbdd4d2bd1b06064a87fd51/jonemimomujuwuturote.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109171137585829.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/sfevd50sqmsji2ajtft0keq223/guraxepuvunujagegosobarok.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/42626868316.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/68209810727.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161350c81d3508---bebuli.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/6758240797.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/89775371328.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/83210881251.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/14157432424.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/47687131042.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/fepafezisafubilu.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_off0000d8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DE 10872 bytes
SHA-256: d758020cc602b400fe99a4f34ff99aa6f6c5507f7a95455ac11105c5c0022ba5
font_01_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 17488 bytes
SHA-256: e0f75bb96ff69f75729aae6fbf1b10df46e5fecda3e2be64f4d0a4a4002ccd1b
font_02_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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