Malicious PDF — malware analysis report

Static analysis result for SHA-256 537952526984c9e5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 17:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33dc38b5be4d0292b7f02e7253c14e8c SHA-1: 588c329b0564e1fa0ca80336153b8145933e68a9 SHA-256: 537952526984c9e5fb74165de6d71ebd9ffc6af2285cbbf4d863a99453347a8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites, likely for hosting malicious content or redirecting users. The presence of external URIs and the nature of the link farm suggest an attempt to lure users to malicious destinations, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613bab16ec058---xemamoleloxibegile.pdf In PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/nisunudizuda.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/retan.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/72229111486.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/dabebivakusafidipukufoni.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/topevi.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/92810825587.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd0397bf9---60494820852.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/61364458347.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/8460790802.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65a356b6a---bugusezaduboxibinelola.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/64565006496.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6b2cf39a4fcaf84a668c891c9e9080bd/xuxosa.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/8334856775.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/lebivopomimebi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b2fb89ecc---28162376146.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/19329328425.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/63474054134.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/tofegu.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/jumuvodukugasu.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/19250870935.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/63621754642.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/sufowojedigesewa.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/peliwudegixe.pdfIn PDF document text
    • https://pokereshop.cz/data/file/21197572861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=phone+pro+apkPDF 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_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 10036 bytes
SHA-256: e36e9518eb3e3783164351a1475f4b2f73432566a203da8223e1aeec9344c96c
font_01_sfnt_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 19172 bytes
SHA-256: 80d34478bc8ab24a32ab772b045d5bdf629ff24d74df41c54650ca1a2f6a37af
font_02_sfnt_off00011a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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