Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb6e7dd32b2a2c4…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 19:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84deaa00ffe7b46adcda7974663d442f SHA-1: aa10554a479c509f733c86151d6e2745ec6391c0 SHA-256: deb6e7dd32b2a2c41cdd1e360c2fd428cab015c29c7b2559d18f9ba8a63d360a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kabaretyimpresariat.pl/Upload/file/58934593910.pdf In PDF document text
    • https://die-elke.de/cms/elke_page_files/file/vojitebisa.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/7bi0h8o63575qie5kok20fj062/79211578098.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/11564476273.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/mojulemuzapiwikidiguwetid.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/3aaqks7mrf68lt13majt49j4i3/fetajeselemewaditoguwi.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/6369fc6a0a125344d08dda2ba7a11d92/degenepob.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/dasanubu.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/11390225179.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/feromorajigigamulukofo.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/lazoxumororu.pdfIn PDF document text
    • https://drlanda.hu/user/file/71203553466.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/224a8f172bbaaadd2ba29a88d59a730f/dosiximegivimo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/br8ebt345rc7a6olg6m34mm1sn/46105721840.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vs8pg0e2d26qtlm5l6kie6be4o/94183401555.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/19297282016.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/31003079197.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074484da889d---32037153693.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/sisunofevupobi.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/18855702873.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/890c97167356645b8093cb9af8d1dc85/veresuwevurej.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3eb0020e9---82459186675.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/xerodupilovog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mcitp+basic+notes+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_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 18952 bytes
SHA-256: 015faffc406418589d09830268e0c8f2f4d4c63bd3effe33fac87a07ff140027
font_02_sfnt_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 10600 bytes
SHA-256: 84348d1df1b599a23482505c5df65fb8a687022311f9e6a202db9d3dd9e27e3c

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