Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d434efbf56fc368…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 00:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2fe2d67680410a03fcc4ca9cca1207df SHA-1: e39c7d74d435d77fd8d633da3387bc2703b48552 SHA-256: 7d434efbf56fc368fddc240e3a5595cd07da9d43809759f35788126737bf9193
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and link farm indicate an attempt to lead users to a compromised resource, likely for phishing or further malware delivery.

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://studioprogettoarchitettura.eu/userfiles/files/motafuwoxik.pdf In PDF document text
    • http://guojingmall.com/userfiles/file///fisubinukokapanopetav.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/61437083593.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140191bd3378---tesunadujelelozefere.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/turojogutilijitilaxaxa.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614794a89d38a---wupeloxusademurix.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/popusonodejuluwowafaje.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614067bf2cad9---50810493354.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/sudelowozex.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/luvuw.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/72524999359.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/88327912802.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/53000162095.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/81613923003.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/6095458856.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/5389735102.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/revejinesugenokute.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a72d9b39---xelaxup.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/73597594423.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/lijade.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/cb599930eb6bbdf09bc360cc8000e949/zimagal.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/jujifebone.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/vaxefelobibifajegabaxit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dr+driving+hack+iosPDF 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_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 18964 bytes
SHA-256: ba64dcbe223dc836053a4cc32d8ae642085deae127df3b0f4b6f5bea3bc6728a
font_01_sfnt_off00011545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11545 10532 bytes
SHA-256: 324ac8d42d5c20eba7e7af04528bea2b3dbf7ebff36fa2f1a794d16bf19e2f28
font_02_sfnt_off00012cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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