Malicious PDF — malware analysis report

Static analysis result for SHA-256 39faa19def54ff76…

MALICIOUS

PDF

86.7 KB Created: 2021-10-15 15:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c9c5ead89cf9f30c7e3b2026739b4fb8 SHA-1: b6d1b3dabf96b86fd00a19b9274d93bda8fdc0a3 SHA-256: 39faa19def54ff769cafeec8ff428c983b03daa3ab786c1308dccc8bd14d38c1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.alexgis.com/siteuploads/editorimg/file/kelesajesitatani.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/maxitagego.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa0dad1de---88989386962.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16154104213839---59804084928.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/zarazodogisuv.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/mexiko.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/fejij.pdfIn PDF document text
    • http://classtool.info/upload/files/pofefalobatezegumo.pdfIn PDF document text
    • http://redactron.com/userfiles/file/78857716263.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/diseniwafiraralenerebak.pdfIn PDF document text
    • https://ancoraeducacion.com/images/gesibilafesemo.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/56160192797.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/90198429989.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613e565546267---84315531214.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202110151537112405.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/91993779111.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161637c03765be---visoxatexegedeputimosi.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/koviborevixesu.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144eb996be53---rikawigosuvukofipinij.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/7520927331.pdfIn PDF document text
    • http://e-menu.hu/editor_up/nevizobofukidutep.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/masozapaso.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/webal.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/56806705550.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/o4nj3qtq2k2ln56tcv5jhpcai6/xebirija.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/oscUj7J0Gjw/uplcv?utm_term=labour+mp+wes+streetingPDF 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_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 10832 bytes
SHA-256: 099d3a4a14e56c879c17fcd9eba6bb3161c081763e791248f7f82c0036e49ad3
font_02_sfnt_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 17676 bytes
SHA-256: 8c298223f1560b8fe91202057226bc6a82b8f25202105f803269b426751fb6ab

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