Malicious PDF — malware analysis report

Static analysis result for SHA-256 5199bbf5fb67a055…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 01:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 74cd802021be6fabc930733a19f643ce SHA-1: eafc594537a08d5afc17472fbb88f1bb26150cee SHA-256: 5199bbf5fb67a0557a9f373bcc5e0b8965ab7860c0e026e8cb2e3d685ea21b5b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a likely attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware delivery mechanism, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kdbelektrotechniek.nl/uploads/file/30675252594.pdf In PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/nobedukagozatapozut.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/29626068794.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/jugogofagarirofigiban.pdfIn PDF document text
    • https://razredna-nastava.net/files/zakuxobajapitapuv.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/zenomoni.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79398746721.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/fabepije.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/14347385396.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/71897735719.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/40713028450.pdfIn PDF document text
    • https://phukienbep.net/media/files/74778965423.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/gevamixokekenawelogiwowo.pdfIn PDF document text
    • https://matratva.in/userfiles/file/31755056779.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6688a3a1c---kosobexopufuxasigobema.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109012159001683.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/73275075668.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de14cb289c---ladeva.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/gewobevitusisuz.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/lorewupiw.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161393a3aa65f7---vikukabegulakawevil.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/3853767189.pdfIn PDF document text
    • http://pinxedien.net/upload/files/woxaleluraxawesu.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/xegurikitasoperulu.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/dasekozikive.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613332c2ccb38---72794944733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=words+starting+with+vowel+oPDF 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_off0000b2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B2 14576 bytes
SHA-256: d27e1b249d09712cf6c1f85dfc24d3792bb01e9c901b31f16e929e3297a31c41
font_01_sfnt_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 10672 bytes
SHA-256: 0cc627c3ef154373082a5e0cee73fdb64f10129a55be38fb0b5bcac06464688b
font_02_sfnt_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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