Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d94543bf6ca21e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 23:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c14b2ee206121ba1b5b11ef3155ba65c SHA-1: 0050d632bd5d71818579b6e3c385e892ee8351bd SHA-256: b9d94543bf6ca21e468e2e1828f338e89212143215cfda24c0e39475f3ea7f9a
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to a compromised WordPress site, which hosts a PDF file. This suggests an attempt to trick users into downloading a malicious document, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddaea8602c---reketo.pdf In PDF document text
    • http://fantalife.nl/userfiles/file/beroxidufonorekiwopu.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/93659371049.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/66780039205.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/96620016624.pdfIn PDF document text
    • http://voijin.com/userfiles/files/fozabolezogumoku.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/lamuvelozirunadavoku.pdfIn PDF document text
    • https://keongracun.org/contents/files/59764004590.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/tizuzifoxe.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/97363233510.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/fosoximetidexozetomav.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/julokosezunafepozujopisew.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/15791611228.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/sorigegimuvon.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/guvunud.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161320be2c57e2---79086005573.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/6425699929.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9c590d1d---72035523992.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/25317828587.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/36887003019.pdfIn PDF document text
    • http://topstec.com/d/files/xupemutuvadimona.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/nukuvimobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+do+i+make+my+androidPDF 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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 17296 bytes
SHA-256: d9ba031aebba8af93f1b05c8235611d20806d8c567e461db53812780ff2260ef
font_01_sfnt_off000112af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AF 10380 bytes
SHA-256: a43aedd5f5dcca6d487f7db94afe744f96382dad9595d7c8276840e468600bf6
font_02_sfnt_off00012a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1