Malicious PDF — malware analysis report

Static analysis result for SHA-256 79232ff4cf97f5d4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 10:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ed0fe607bce05d4e2824df28561e5fb SHA-1: 7e4b150c58361a22ed8cba7986fb1c3b773e387a SHA-256: 79232ff4cf97f5d4468d47ad736cbafe637895aff8c1afd58bbe8106dd182e40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests it's designed to redirect users to phishing sites or download further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to create a large number of links on potentially untrusted domains, likely to improve search engine ranking for malicious content or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=descargar+catalogos+cklass+pdf+2019 PDF link annotation
    • http://palazzodiaz.com/userfiles/files/77548594221.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6aea7bf65283b0d56e2230ac03bffb3b/91339485184.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16125878ae77fd---25976384512.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fb407d4dd---kamodudo.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/kizogelir.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/53260190470.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021071415370573499.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/xulunokozufivutezuwevir.pdfIn PDF document text
    • http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/dagofudit.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d379717a9ae---ruwumin.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16094774c9304a---kesoratuvuzifowel.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/vofekawulirofokagef.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e48dd6a1ac---kepubuvi.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a5a059017---77335765183.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/71115865291.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/db03a07e4958f01f2979625bf2f3094a/metupuwajuxasunenitoros.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/9a0973e4016284dc4a507f8701177eb2/fupaxorasemijal.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb403629faa---kapofipufesuritixilewefe.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/xidazugedufizude.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/dagasafad.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/26476120127.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/jorozoguvimusafaxudem.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/nixiw.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc522afdc---kugaxa.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0fb089b43189810c385d04afffc39c41/sejazilubavufofifawudami.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/51656313196.pdfIn PDF document text
    • 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_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 11156 bytes
SHA-256: a2bf7fcf7f879c374a8afcf0c77b58eb7c91bffa5c4733d013200190dd213954
font_02_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 19256 bytes
SHA-256: db2468fb4cbc4007beea3d6738f307f11161461435d28bda4a10e0a65ab3c91c

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