Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5b8e5e0b688c53…

MALICIOUS

PDF

90.5 KB Created: 2021-09-09 04:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8656180efa73ca553df64b81d8a365a2 SHA-1: 74512979f3f7e52d6eed0592df20e5d93a5d01ee SHA-256: 5c5b8e5e0b688c53abfae8bb22c3b90f3aceea3a2d793cffb47ffae0d26da2fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://unsersohn.com/images/file/sujoxevijebovetozi.pdf In PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/5gpu8bp2pm56adk49dkbkpdru1/26877548955.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/1742490668.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/kenojalefelaxiba.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/zajipalupuf.pdfIn PDF document text
    • http://cwesp.biz/upload/file/dasamutufe.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109061025247717.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf4a71024---giboboxitamefadosetop.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/towomukovirozinedipevun.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/95254244954.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/91576433986.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/boxolutudetomuso.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/2461308221.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/59264251084.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/wuvavifase.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/ketoxijukoburepemabot.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/medijorojezalili.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613932e9a961b---86051049064.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/75608106854.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/fewulowoxoxodibaxibefiru.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161393d8203b58---24296897306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=naruto+blazing+download+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 10724 bytes
SHA-256: c474157e1da531ffc55b5318d23a17453d326ec928ade96a9001d88a51468a3d
font_02_sfnt_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_03_sfnt_off00011ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA7 22024 bytes
SHA-256: 23b6ca4315508374b2a3665077a6bbd65c16c126684ef72ed15537cd6546d5ce
font_04_sfnt_off000153f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F9 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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