Malicious PDF — malware analysis report

Static analysis result for SHA-256 c123f671d251416e…

MALICIOUS

PDF

90.4 KB Created: 2021-06-27 07:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a41f9d33f5493180b7da0398b2b4cde1 SHA-1: 7400ce0f42375016f8e62f0bcff1a2f32624d067 SHA-256: c123f671d251416eedcddaabca3ea73ef966d08cf6696d8edc02c7ac6a1bb454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://eau-msu.ru/ckfinder/userfiles/files/naxibatijiditijeka.pdf In PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/42296079.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160adcbd1d02e7---6059267397.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/kajapipimi.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/fakezujupizuvobowaj.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c9318cc93d9---paviwabi.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ijqave86b2cve5b8fsd8f09rnd/lirivofaxanelebumepas.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/36054049748.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/56414808716.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/gonasamidafatuporoti.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b341fac8c0c---14127231889.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/80ec51074f7edfc61cf317c2f5d89f1a/86796037785.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/21444711657.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/bopurepipedorijikevidi.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/gjg86i6s2ldrqhqq0m2s61kapk/17888430519.pdfIn PDF document text
    • https://windsbs.biz/files/file/somirufizo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5752e149b---jamumola.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/xiraxulij.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d274feaaa8---gefivedimuvuzijugomuz.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/efv4jf9oioop8v5ul5rfhkcks2/tanotutikibunubanofutavox.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a2506680e---46259997957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tron+in+bankPDF 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_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5A 17236 bytes
SHA-256: b9c573510cb6a9ccd3bf1e81aa4960d2a37b705f749e13f5c0d58a83dae92f33
font_02_sfnt_off0001471d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471D 9852 bytes
SHA-256: 5a266965ade740c1644e65da6ffc239b4db615452cb4c9e7ce8c86a318f567c4

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