Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7a64437853b0fd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 09:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 844f3c78da68bd47346b43a71a02b1d4 SHA-1: 76b9b82bd77e1156981f64571fb4c8cc211e821b SHA-256: bb7a64437853b0fd4d67bdc1b3e7b6883b34669f97651ba0108c2dcc9a8e1c2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, some pointing to compromised CMS uploads, and a visual call-to-action button suggesting a download lure. While no scripts were directly extracted, the nature of the embedded links and the ML/ClamAV detections suggest it is designed to trick users into downloading and executing a secondary payload, likely exploiting a client-side vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094749e5ab35---39669759012.pdf In PDF document text
    • http://se-ty.ru/uploads/userfiles/file/gisugevupivivet.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1628334378_ece53a828f.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/musiwedobusod.pdfIn PDF document text
    • https://unitjaya.com/contents//files/mugolejuxukivixuzasow.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/rewejoni.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/ximovudifujosakalop.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/rebamojer.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/momasewolinaxab.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/244a0e050513baf3da8b5695e187f96c/75831245915.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bipelexitezosupawu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa350e102e1---sojuterexemamobibavokulok.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099ceedcc4fa---4454717658.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/39097696479.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/2l6k4im3r2ihegl74qdg08t7so/91720809947.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/radupiremobetoketobojezi.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/36592022571.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607619bacbd4f---78051114501.pdfIn PDF document text
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/78775449358.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/jijosovexeguvomugeripit.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d05747daa59---gejakitovus.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/1d4a219bcb58bdea038d241e4dcba221/baruzapubane.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/89708024999.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612179dc9652d---jolowoxaz.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9bf52bc1705ef8b5bde02505f4b1407/mefiralonezidegixose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=labour+relations+act+66+of+1995+south+africa+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_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 11436 bytes
SHA-256: 718db2721c86c4264966ddbad9a3775c43471875e94ff238deb61bcd6211fec0
font_02_sfnt_off00010a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 17708 bytes
SHA-256: 5044c7d3dd41deaf1d1cb38cabb9e7267dd03ff79c6044a58ad733c2e56fdcdf

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