Malicious PDF — malware analysis report

Static analysis result for SHA-256 019924b0c19b26fa…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 04:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 252957ecc861f29b9deaf84c2c5f2052 SHA-1: f1f3f2ee89e201c5821c11fe289d99f65a7114d3 SHA-256: 019924b0c19b26faf31f23e8fbac99e80955927faa490ff1063269e353e087fd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, despite some being marked as benign, contribute to the overall pattern of a phishing or malware distribution lure.

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://www.ettermanenterprises.com/ckfinder/userfiles/files/51113896177.pdf In PDF document text
    • https://spotiverify.com/ci/userfiles/files/57340458096.pdfIn PDF document text
    • https://granitnet.hu/editor_up/kativa.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/bokamiruf.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/94974359143.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2f916bafb103c48b53e3bfd73f58336b/76915654108.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/15246597601.pdfIn PDF document text
    • http://allier-genealogie.org/File:/wezasezinekewupasurig.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393347a705c---riwejigigojuwikivotox.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/kokanapuzat.pdfIn PDF document text
    • http://nktrading.qa/file/files/zosolofituvamomobepiwabor.pdfIn PDF document text
    • https://ccskin.com/geektic/files/67177745699.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d43bc2c6---sejavudunonisifi.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/15228551388.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/19462290231.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/wuduxabupogupexifulerif.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/xabaxuketakeg.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/71370669986.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/31291971147.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139627806b23---72076615457.pdfIn PDF document text
    • https://krusomying.com/data/file/88319482520.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/negumeliginetebakupoxaniz.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/ziwowubekanevukodagaf.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/zeduligufodefunonixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=a6+plus+screen+sizePDF 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_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 10296 bytes
SHA-256: b8aed55f0f7a19ef3dd6dee847f016da095f35d039b5f8cb18b8f893daf92cb5
font_01_sfnt_off0000f60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 18600 bytes
SHA-256: 6526f2be74c9726685fe06e906561f65ab817761d8183e9cf6e26f571671e65e

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