Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c98015be3d8563…

MALICIOUS

PDF

64.0 KB Created: 2021-09-09 11:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f484c564237b79463a37d5a18910290c SHA-1: 49885490cff2d55e76903b2490a6269b67f84142 SHA-256: b4c98015be3d85633a742b65487fb27098f6dc1370b749d6bc00742e5f7cfdb0
154 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many of which point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links and the nature of the hosting indicate an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9403

Heuristics 5

  • 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
  • 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://groupunsur2.com/contents/files/nibilidadesulurafev.pdf In PDF document text
    • https://emprenderem.cl/files/39274434868.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/zoputenokibugemajutuji.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/18765606276.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613251d5ee678---gasigugigixajabagulomol.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/31009488667.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613406533f028---vogetozis.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/vobisumafek.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/48720509212.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161389b08b0ef0---38807482262.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210909075243.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/4078285671.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210903191715.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/fidofiteputunobonun.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/71117896273.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/7239136559.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/woseguwuzod.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/texoposogusoxes.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/15140595378.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210904053505.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/39449659598.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/18813736397.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/43884048119.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/61316813750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=offline+hacking+appPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 10392 bytes
SHA-256: adc4525f92b615ecf72f562d60aac9819925d6d969cb3045624486286f835f04

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