Malicious PDF — malware analysis report

Static analysis result for SHA-256 548ac77d59df4cca…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 15:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: adda9acc4a64adec778d8b26c91f75b6 SHA-1: e7ac03486cdefae35cfcf651476d9bf2927783f8 SHA-256: 548ac77d59df4cca6858cdb059144fd984a40fa15aa4bbe4c7c87fd460bd99be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are compromised WordPress upload directories. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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://handsonmontessoripk.com/userfiles/files/medelesudoxi.pdf In PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/84673649583.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210901230128.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/josoxuburivizaraxugun.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/bodox.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/65894152498.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/vuwugo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459df0e87e4---fifemonilisaruwibo.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/56527069137.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/38046736673.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337f1677e7a---julozuniw.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/bebirilomiziroropenop.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/toremob.pdfIn PDF document text
    • http://strandedtattoo.info/file/vogijol.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090902013573499.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/52213303715.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/jofibiwuna.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/86669851352.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/35097890355.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/lidab.pdfIn PDF document text
    • http://recrute.fr/files/files/lofekojogijesapalojikazaf.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hf7ege53rcgdc2pc76dg8t3t6n/5574198460.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/36150930635.pdfIn PDF document text
    • https://rcot.org/userfiles/file/43220282906.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/gixupekofagadikekakiwalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pixel+car+android+1PDF 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_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 10252 bytes
SHA-256: 8b622c74b5a3af57378afe8328a2b5ea317dc3038be1fde9f5885b925c95e380
font_01_sfnt_off0000fc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 17828 bytes
SHA-256: 9061f5c8360ae7f75cb3b1d15546bd5d246d8aca1ef60a824cc6959a115a192c
font_02_sfnt_off00012a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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