Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc16b50c3441980…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 20:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e85dc501da502dcb75989a034656ef3 SHA-1: 67267ad275002c178dd5f9cf6cf9383ba39ead8a SHA-256: 0dc16b50c3441980cec60c255011991f50277baba92c1c92f622ed39ae2af43f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues to its purpose beyond being a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://veterina-naslunci.cz/userfiles/file/23579611553.pdf In PDF document text
    • http://baove247.org/upload/files/zuliwerof.pdfIn PDF document text
    • http://scpt.it/userfiles/files/gugitonafabiniwuxawe.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0fa26d2af---64705250933.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210920070625_109790800.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130accb89468---kumutepira.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/nubexabur.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/22962238149.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/87392863267.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/43293710293.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/tokeruxodoli.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/74548866979.pdfIn PDF document text
    • http://exosushi.com/uploads/files/vifemadufepupas.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/94575354761.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417f52cb9ef---58397133203.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ca7a96ca7---46297444350.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161338252d68a4---nedufugexovesigiferi.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/xatozakiwesafinimeliju.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/62708268438.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/29370255396.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/70166715462.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/dugukilagubixopu.pdfIn PDF document text
    • https://guadix.co/ckfinder/userfiles/files/wuzorutumosuguxirune.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/bawupevoxusodegefukivozub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=love+on+rent+web+series+watch+onlinePDF 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_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 10576 bytes
SHA-256: 78a758f98b67d4a06e842d10f9c7c0853aa674cc48172c18618b51a888b88c66
font_01_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 18112 bytes
SHA-256: 200f9a082a278c651fe9fd7ef057a581ec329e6373fc6ac99da9448c395ae817
font_02_sfnt_off000125a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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