Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4093426e90e67fc…

MALICIOUS

PDF

76.0 KB Created: 2021-09-24 15:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 926c331d92ab9db713f76c8a51174488 SHA-1: de7bc96e3582758a00513c9884f5f7512c37ced5 SHA-256: a4093426e90e67fc73f59d2fb5ab93570c13d0d7ca61476c6f9ff85935573c3c
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. Numerous heuristics identified the PDF as a link farm, with many links pointing to compromised WordPress sites and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://pixomot.ru/uplcv?utm_term=bester+virenscanner+f%C3%BCr+android+kostenlos
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132795e451a1---rubetufapogu.pdf
    • http://alptw.com/images/files/gopazekiw.pdf
    • https://vildmarksjagt.dk/userfiles/file/jitojupadugedosar.pdf
    • http://huefpdf.org/upload/file/84200374468.pdf
    • http://ingore.cn/upload/files/ziguropojumijizizemisujet.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/36544408927.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/626e4b423c4e0d472fced165c0098400/22515110479.pdf
    • https://whatshoulditcostme.com/userfiles/file/dajoz.pdf
    • http://uptindia.com/newsimages/file///burev.pdf
    • http://huspanda.com/data/ckfinder/files/15147748380.pdf
    • http://kleinschaden.expert/userfiles/file/86559821758.pdf
    • https://koncnc.com/genelresimler/file/56806883314.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7f4cc644---verir.pdf
    • http://rkenterprisesonline.com/FCKeditor/file/92564238290.pdf
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/jarozizenajewakekusolu.pdf
    • http://riccaassociati.eu/userfiles/files/37328674947.pdf
    • https://manhremhoangvan.vn/wp-content/uploads/files/89296021676.pdf
    • http://hejia-ele.net/upload/tujuge.pdf
    • http://creaorganization.com/depo/sayfaresim/file/loxulezejew.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/249272c7de7a5ea500f4f64cc1518db5/70699069301.pdf
    • http://fujavietnam.com/images/Download/kenonixenujowa.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/jotare.pdf
    • http://moderncarrent.com/user_img/files/85815000632.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bca5.bin
3246dc441a41913385409d9588a358773c385ca2b34bd55bd0eb5fb40913fbe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA5 19404 bytes
font_01_sfnt_off0000eeef.bin
b80dc4938e866a36cefa2ab23e756cd3dd593adc3ce78a8e97c55d8ec89e48f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 10872 bytes
font_02_sfnt_off0001082f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1082F 16792 bytes

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