Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c725f7a1b1fe7f…

MALICIOUS

PDF

72.7 KB Created: 2021-10-01 19:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8459ac9c52f6ca87c3b6627f8ac5a792 SHA-1: eeaad8017a329740088acc9eca6f58ca4bf04d8f SHA-256: f5c725f7a1b1fe7f5c9d200169b4bdd5813ee0720e7efd4579f503da12a931e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/uplcv?utm_term=a+quiet+place+2018+123movies
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e588da148db06c955532de12e31453f1/15140167626.pdf
    • http://lnhaihui.com/userfiles/file/20210906130705_2140775848.pdf
    • http://hb-hospital.com/file_upload/fck_upfile/file/17865159430.pdf
    • http://szentistvanpatika.hu/upload/file/70407480222.pdf
    • http://fundacionecla.org/resources/original/file/86566443445.pdf
    • http://longchimvac.net/app/webroot/uploads/files/57997722769.pdf
    • https://mirrorlink.com/public/files/files/zitudubitamudexin.pdf
    • http://robwalker.net/fckupload/file/soxazotogep.pdf
    • http://duancanhotot.com/upload/files/62052613304.pdf
    • https://temporar.mirceaseminee.ro/printuri-fi/files/46123123287.pdf
    • http://www.pattyn360.com/upload/forum/files/33478112917.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d51760627---febakukipubewisej.pdf
    • http://karimeh.com/public/userfiles/file/66915923493.pdf
    • https://www.passion-rnd.com/upfile/files/2021/09/25/51995265673.pdf
    • https://rasathantrananotech.com/ckfinder/userfiles/files/ruvabiwukefagobevim.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2eb23a7195a78ae77b105244d7797716/70738425638.pdf
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/xevuzijetolewoveb.pdf
    • http://pekingtogo.com/uploads/files/lurozajiberenu.pdf
    • https://piauiaqui.com/ckfinder/files/31850500370.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_off0000b1eb.bin
28f7c8b2b53a9570ae71ef9fb201f0ad95a7fa299e258fa101baff7b097f2857		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EB 18344 bytes
font_01_sfnt_off0000e14c.bin
ae05063d3b48bf95052fca5b2c0307d44f6f8e7df4e5e373e7088a8f86ad1baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE14C 11296 bytes
font_02_sfnt_off0000fc11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 16792 bytes

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