Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebfb143f407eb0f4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 19:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19c5365929ee4a5e206cb57edf734d12 SHA-1: 26037eef708ff29b0f04b014d992a34bccd823cd SHA-256: ebfb143f407eb0f459f2a8436ac3c198710b8ce1598f021262cbf59eb86b06b9
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://talesma.com/E/file/63319925301.pdf In PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/28416147676.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160982b23933f8---44789598376.pdfIn PDF document text
    • https://wittnebel.dk/file/45872533697.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/21137906494.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/27080433245.pdfIn PDF document text
    • https://egca.fr/userfiles/file/rumerobodibolu.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/dajabarunenetoz.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/62821309359.pdfIn PDF document text
    • http://richfieldhighschool1969.com/clients/868116/File/85098765274.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a68991fdbc80548a39d2ae2b5b6bf045/xerulamoludigixij.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/8108864697.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160acf34c3aa8a---90272819830.pdfIn PDF document text
    • https://mszukam.pl/dat//file/bisukoguluvimavonojafubo.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-8-13/20210813005835945586.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/damorulo.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/42083519041.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/josakiwimugorivofokage.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/menadoditobukigifewe.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160727f09a89f3---54675937528.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/25827837688.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/87758004229.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/2951291895.pdfIn PDF document text
    • http://cmtsport.com/pliki/49985805122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=feudalism+and+capitalism+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_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 10640 bytes
SHA-256: d526de1fa4449aabaceffbc392b65eae9ca225c55e8c06131a4eaa2ebb48a152
font_01_sfnt_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 16680 bytes
SHA-256: 6858364a053810e5117ebed55884a2c633b51686b89db43d77a751b4f5be93f0
font_02_sfnt_off00011f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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