Malicious PDF — malware analysis report

Static analysis result for SHA-256 915d5ec6962c29ae…

MALICIOUS

PDF

72.5 KB Created: 2021-09-06 09:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2382e703d993c4730320d97b41e98759 SHA-1: f6caa342054db6ae2e1542fc0077ab5a3b4f73a8 SHA-256: 915d5ec6962c29ae8a37c081b72db7f34c2eb4ab423f7fd5456ded7cf1ff6fd9
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The primary purpose appears to be to redirect users to potentially malicious or phishing content, leveraging SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8fe67ec8f---32170062622.pdf In PDF document text
    • http://sport-zavora.cz/data/file/89467720236.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/lejaxafavi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5fpfrs80srjcoo7mg4pr15sqgp/dalorex.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/subokufaluloj.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/32747501578.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ab555563a515f47979444f5df6dee50/19778721220.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/gevafelul.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609874c50961e---64576140846.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/5513585958.pdfIn PDF document text
    • http://industrialdevices.in/uploads/24468041267.pdfIn PDF document text
    • https://soechi.com/userfiles/file/77079934472.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48791a83a---razimekalarogasivafolilab.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/gujawobiwoluxiwub.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/didebewiwumumij.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/11509014025.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d7fec8e8---62731183426.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/vetalar.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160750305987a4---jovuporixuvi.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/liruvo.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f42a8a999e3e6364282caa00e619452f/bijuroropijulejebagi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160753bac11d9e---61430731406.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/14069977721.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/wanezipefegup.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfda45e2af5---tolanamalo.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/48777834147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=application+that+can+edit+pdf+filesPDF 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_off0000b987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB987 10600 bytes
SHA-256: fc5040a49220c9a4d7a44321bde9dd60ce2767d4cde8e11ac4bcd0a70a4b78e3
font_01_sfnt_off0000d1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B8 16856 bytes
SHA-256: 1f579f22de1a7dbe381ec6c77e7e7b74fd94d7bf0239634e61f56fe845a132d8
font_02_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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