Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf6d52143c15dc5…

MALICIOUS

PDF

72.3 KB Created: 2021-09-25 16:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5ca870ac247fc02c4a28d8f4eea770ba SHA-1: 1a9ad1a0b3905783d6557ec32a47cb45ff085743 SHA-256: 8bf6d52143c15dc502de26b574042078fb3c755ee9d445c5acfc68be892339e6
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads, suggesting a phishing or redirection scheme. The primary malicious URL leads to a PDF hosted on a compromised WordPress site, likely serving as a second-stage payload. ClamAV and ML classifiers also flagged this file as malicious, reinforcing the phishing and exploitation intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://macro-e.com/app/webroot/userfiles/files/rubajozaseloxaramufogulam.pdf In PDF document text
    • http://midospa.com/upload/files/padegakinopunajago.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/bexekijajiboduxuzimi.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/58831042160.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/44971296004.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/pefosurelev.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/pusuveduriwedevaxoson.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/97980877106.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/biveziza.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/faweregenibibajefetub.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3c47a96bfb50e44f07eefa055e560fa3/lulufewisotadawati.pdfIn PDF document text
    • http://chanassociation.org/uploads/file/37053967027.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/95642714004.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021092518414273499.pdfIn PDF document text
    • https://norservis.info/files/files/wasalabibupofujedik.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/m85klo0sdgslcou7udfv3slll6/zeviwomivoposozoguruwujo.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/50041150220.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/bfbce4600caeaf6ca8dc8f85eaac6983/tabapubuxoledujatubovike.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/26c256kccvkvin26jtqv65slb4/91338279487.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/busogakiwenem.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1630657745217.pdfIn PDF document text
    • http://livestocktool.com/d/files/fojikukuded.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/fesafup.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614b4846adc70---7667551738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=a+cinderella+story+movie+onlinePDF 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_off0000b55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55E 10692 bytes
SHA-256: 6a0c43874165a50d58d4e26ed3e7808df669d9abfa668f1124161ea7457231d3
font_01_sfnt_off0000cded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDED 16992 bytes
SHA-256: 420cbc83156009730e12da3d5a316dfe62182c2a6e702511d190b233531da24b
font_02_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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