Malicious PDF — malware analysis report

Static analysis result for SHA-256 167ea0a2ed7695a1…

MALICIOUS

PDF

87.2 KB Created: 2021-09-05 02:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 90fe1a1d62891d7095bcea45ffa9ba7a SHA-1: 43b0c57cfe07805a39b244c29a47ff1517147352 SHA-256: 167ea0a2ed7695a16e91ae1af70bfc5206ada5b4b1ec526afcb8bd2f9066c0f9
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or SEO manipulation. No scripts were extracted, but the embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3bdc8590---56044811627.pdf In PDF document text
    • http://usefchina.com/uploadfile/file///2021080412301088.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deb62fb3a2f---padonironisolawijulujidos.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///54691417646.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e463fb52e08f96142f1149f6f6f624b8/jomezexiliw.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/93592768667.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/jirutu.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/58184321377.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160729e70a4c5b---27059883278.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/2778855977.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/tupumoxo.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f6ed117e3---xokipitikuv.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/pumurasewoduta.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71ccff2d1b---noworixemafuji.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9f5a1149---wakagodixowiwexusozev.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc86959a9d1---zobodepejazabub.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/99289252894.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/50308614491.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161040c84b9133---57042907476.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/maxitavomop.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/mavob.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/dssos5io98oiggc40o6m86crd1/77273798399.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/majuwagez.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee5b79e41---sivunenixadubuzifot.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e5910d131---lojulozegategod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mackie+profx8+8-channel+mixer+manualPDF 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_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 18708 bytes
SHA-256: cfec6fb12dcffcfe7e50ed4c6ec94502e7017ea7d4cc4c255b624932b900498b
font_01_sfnt_off00011d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D88 11008 bytes
SHA-256: e357565fbb0cead56e826c247536e8cf61836dc2311153d8cc97dbfe1ca12ec2
font_02_sfnt_off000136fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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