Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5775b866df9d3e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-11 18:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e12da0c38792f384efadbc025c4e86e SHA-1: 17fac3a41876fe28fe2aa0bbb242da3cb2cb82c7 SHA-256: 8f5775b866df9d3ec40c753e657036ef84d1ae6405c14cd99d1565559b064372
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the detection suggest it may leverage embedded JavaScript or other exploits to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vallovin.it/userfiles/files/pozifovezere.pdf In PDF document text
    • http://kleinschadenexperte.de/userfiles/file/74127312131.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/dovedexobedig.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/tumorugufimitamutikidi.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210910035928.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161357650d5b66---jebuwuxapikezidu.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/wakedosobikokabaz.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/pavenige.pdfIn PDF document text
    • https://duel.pl/userfiles/file/93747548663.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/60017170357.pdfIn PDF document text
    • http://rideco.hu/upload/file/dotifuvepuges.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/xapefilejuvupanibusiwota.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/musalumev.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/vifugebixe.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/lamureda.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee09537ffa---69394981200.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/57408672746.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/65028133882.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/9892456832.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164e6e3bd9---xonarokile.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613243f3e6a5a.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/wasudapuwe.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/942fcbcd56497a165bad75a861c4658b/88736008490.pdfIn PDF document text
    • https://norservis.info/files/files/89014867453.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/92096186984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=messenger+not+notifying+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_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 18764 bytes
SHA-256: d9217d8202cdbfbf71b27948d714a0ecc754154b07b193700d864f1e14f5507c
font_01_sfnt_off0001167f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E96 10588 bytes
SHA-256: 9d28c63a9f89c5d37282e5cec709d59a4c236b2dceeebae99824d5e16eb994a5

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