Malicious PDF — malware analysis report

Static analysis result for SHA-256 5732ce736569285c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 04:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 323df426875f31677f2d697eb0542b35 SHA-1: 83fa3c356dc0148581caeaeeb1640384c500484c SHA-256: 5732ce736569285c2b40e88326c4e2e1504148f51f3821e5f7e150c5c347cf15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=zoo+craft+game+download
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161420cff547ea---zaputubi.pdf
    • https://fo-prefectures.com/pages/files/31797502274.pdf
    • http://kruengrangthai.com/files/files/demano.pdf
    • http://tieulongcopro.com/luutru/files/88856711551.pdf
    • http://ggmtc.net/userfiles/files/54710217609.pdf
    • https://xn--80aesyq.xn--p1ai/files/file/kugewot.pdf
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/vovurabegojowepenedu.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/68084573272.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/lanezotupifalarido.pdf
    • http://supermarketdv.ru/files/file/59264825832.pdf
    • http://bjdfszwy.com/filespath/files/20210901115817.pdf
    • http://esebtekstil.com/resimler/files/taxilefetil.pdf
    • http://liqaa-lb.com/files/userfiles/files/tivika.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614238be002e4---wevapipuzozugemukaxak.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/3mvq04uo5q99o9qf5l3toaogli/78053435341.pdf
    • https://regiefranchet.fr/userfiles/files/54445837973.pdf
    • https://svingenieria.cl/userfiles/file/pofixiwosinori.pdf
    • https://toolsatool.com/userfiles/files/17250938845.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331f5533374---95233213799.pdf
    • http://akicgiyim.com/userfiles/file/fufiwagulipoz.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/43cc9495f4b4f760a45558c6c77aee71/jikiwovivozoxolujo.pdf
    • http://citescolairedeledit.com/include/file/ribuwapesanitevomuviz.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc45f93f24---jewanomafifat.pdf
    • http://lightningriskassessment.com/ci/userfiles/files/32080502209.pdf
    • http://travelci.ru/ckfinder/userfiles/files/22747100108.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_off0000e042.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 16792 bytes
font_01_sfnt_off0000f854.bin
0489cf6aa77aeea54e690e631acc65ab81ae6b9600173263dfae2cdfb7a34aa0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 17684 bytes
font_02_sfnt_off00012691.bin
43a504b487d7fe68c1208735943497d7c18347d68a5012ef8e3c78281e4ff459
pdf-font-stream PDF embedded font (sfnt) at offset 0x12691 10608 bytes