Malicious PDF — malware analysis report

Static analysis result for SHA-256 d315d63e8d2beb1a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-23 06:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a6f2f6264556d34b96079dc40c931d16 SHA-1: bc33cb40ad9e7df7ee7755cdcec6ed704011d24c SHA-256: d315d63e8d2beb1a286a935b6bb754f30a1058755b1a1dd679d588441b48eff4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and a high number of external links, many of which point to potentially compromised WordPress upload directories or disposable hosting. These links likely serve to redirect users to download further malicious content or unwanted applications, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=vfly+lite+apk+download PDF link annotation
    • http://interstyle.org/content/xuploadimages/file/dubosutekuripepajaliximop.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/manarisewute.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/90973594720.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614181aa899f6---vuzupazafudel.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/rizodexatixan.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/88251631437.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/24460670002.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/82552611818.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/74190281481.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/vajafitagutitoso.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/60465915183.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/boforapudiwatupobifosusa.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/31567300696.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/pilasex.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/78912927330.pdfIn PDF document text
    • https://davaocarrental.com/images/file/90944887383.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d512f18bbc---sawafejarokaserisuvo.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/peniwinotatolu.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/27235214733.pdfIn PDF document text
    • http://newo.ru/files/files/15221708210.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/muwexi.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/23939643882.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0f73c0644---68178237105.pdfIn PDF document text
    • 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_off0000db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 17960 bytes
SHA-256: 1102f016bf46e82ac7b4aa776236904bd6539696f5e9ebcb4bae05223bc5b6a4
font_01_sfnt_off00010980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 10484 bytes
SHA-256: 8c7c353c164189fde271df57a64f173c51fcecac8b243d379545e871ed9a2691

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