Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5320c98278417d9…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 09:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c967312783c4b90a1cdad6a670c7744 SHA-1: 3ac2335f4612522a23466e75057d1b7562424403 SHA-256: b5320c98278417d935ba39ea901df1ad3d228a81596857f639e73c435b0c58f4
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites 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 distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://alley.52886.tw/uploads/files/sepufavisutetip.pdf In PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614897afdce37---9424541422.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/mowifaju.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/pilagufisonep.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/64839253768.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/ranag.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/46240341972.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/81444714723.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/36988341887.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/86440218727.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/dopewovexumevokekukej.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/zixubatutizewavewo.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/64379292873.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/59111224648.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb7c65aad---moribenusodipisabon.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/94476042597.pdfIn PDF document text
    • http://myredm.ru/uploads/file/94733849858.pdfIn PDF document text
    • http://12shio5.com/contents/files/xumemamuluzo.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/boxefunafofavesajapajano.pdfIn PDF document text
    • https://rippa.pt/files/file/kitazinutu.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/wolunedabetuxuwidujos.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/75c97fde5f9cc9dde4528bd625cfd283/dumividaragopogasamenino.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/21091202470159141498967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=html+email+on+androidPDF 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_off0000b315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB315 10232 bytes
SHA-256: a83bacc6416180a596ebc01228f625b0c7583f08ec0e8ad37b25dabd0e47c3ad
font_01_sfnt_off0000c9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E7 15916 bytes
SHA-256: 552d58ed4f2580eaaeb98f052d432814afecbeb3f3054c184755938a326b998c
font_02_sfnt_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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