Malicious PDF — malware analysis report

Static analysis result for SHA-256 de188e13627f51e5…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 23:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 57bbceb3c2b3d9cef4d4871cd5aceae9 SHA-1: 8cb19d8bf0db675111aaa864d72cc031174fe2aa SHA-256: de188e13627f51e513c1053ea81dc74eb26592338f56845e53c8711398d03502
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing attempt to lure users into downloading files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://studiosantese.eu/userfiles/files/28657221618.pdf In PDF document text
    • http://abwwilson.com/uploads/files/minazukunikuwul.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/5436089400.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/he2gmtt5t1a6qrvolutprct4h0/sezuzikubiberejavebanezo.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/85113266777.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/27e576228a815adeaea4be76ee4f08a2/42069946810.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/35089332156.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/85205630031.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/laxepobesizizolemawonidul.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/72496420415.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/suloxafovagak.pdfIn PDF document text
    • http://xn----7sbabjlebzbdsbxti2bw3r.xn--p1ai/files/files/rinax.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/71950302671.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/kidadurazejex.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/delakimabubozafulob.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/14649872277.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/jepivilukapavixezawajumax.pdfIn PDF document text
    • http://clickvay.com/upload/files/11084048340.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eefd8e5846---takaniximix.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/78363622793.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/wuzen.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/tepuwoxibiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+free+fire+apk+new+versionPDF 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_off0000b200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB200 10636 bytes
SHA-256: 6f3476d14c01b6c2011fa12d4b93ddf30003a17186f1cb2a8825ce8c679d9ca0
font_01_sfnt_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 15216 bytes
SHA-256: 8fe1ed4f846d9607663938b81fe4bbca3156bc99d4b6ba5470290733abf386cb
font_02_sfnt_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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