Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ca26de486707cc…

MALICIOUS

PDF

74.7 KB Created: 2021-09-23 04:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96006f3c9d4eee693cbcbe6d250c8db1 SHA-1: 1ef0044b40e7fd186fa23ce81c01b5a1cc20f1f8 SHA-256: 97ca26de486707ccde4b4f04fdd019e37db51535da93e1fe97919d6ee18832ab
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://jacsonsfurniture.com/userfiles/file/vutefapixumosemod.pdf In PDF document text
    • http://ebus.cn/up_file/file/99710038853.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/wopowu.pdfIn PDF document text
    • http://xfswchem.com/upload/files/38583055739.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/dikudisobitizarorafotenol.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/ledebux.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/60448613725.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/gibatujosusenopagumidanu.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/56414292033.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/13712448774.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/48609985296.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/puxeb.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/begibosovijeregulelet.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/geirnrjj0fs9gh7ffjk5p6g8m7/6766921708.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/kakixajadujukanivegiji.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/71776976591.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/19190284625.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///mitekawin.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/98479719095.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/vulugewomatumez.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc1bdb3e1---8804043875.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/poxavaxirumuwowudonixedap.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/10069358350.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/mirowelifi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ed992fedbd3c5f1724e68d31b746804e/63127127477.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/92779122888.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/ropirudutejagamofezaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=secret+calculator+apkPDF 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_off0000c2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C4 10268 bytes
SHA-256: d0de012955a3b874e3e160c847672a73f1a428483967e533c7b85ce5adc8fd75
font_01_sfnt_off0000da0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0D 16584 bytes
SHA-256: f9b6f6e588f7d92d40b3573f73047df1f1c10a66759e4aa812db2d56eec210b1
font_02_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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