Malicious PDF — malware analysis report

Static analysis result for SHA-256 164dd83f0457a145…

MALICIOUS

PDF

74.1 KB Created: 2021-09-11 21:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c872ed9a59d164219205b5d8f71f86ca SHA-1: 3f9da17aa75d8e5029f799258ba0687044cf974a SHA-256: 164dd83f0457a14519746eb1add08e6f31680eac797126fca599ccba04f0b3b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely to distribute malicious content or phish for credentials. No scripts were extracted, but the presence of numerous external links suggests a redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://huntic.ru/uplcv?utm_term=mega+man+maker+android PDF link annotation
    • http://ipea.kr/userData/board/file/9797274280.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/64635839233.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/vifazevud.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/21210496027.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210907213330.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/legux.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/46035912165.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceffb73191---16037778548.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/vibutelusone.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/gazifuxuvesezakal.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/jekobesifavomamad.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613422aed03fb---fosumakuvuxe.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/bosinujaworizigetaxiz.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/laxutowufumurifituna.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/xatil.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/kekavixosib.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/weteguko.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/22336214515.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/30554169579.pdfIn PDF document text
    • https://songhong.info/userfiles/file/jilenexofipifode.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1b8b95df---zuzixadisegulilugevo.pdfIn PDF document text
    • https://expomediainc.com/upload/file/mivekunem.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/dutujofujapurojepexiwi.pdfIn PDF document text
    • 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_off0000bd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53C 10364 bytes
SHA-256: 1a73011162b9480bacb4d632f357fd103fce2357239370edd1063725fc1cfbab
font_02_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 17748 bytes
SHA-256: f5f5ca759570297aa9947e62a9c1fe23fd523389bd6606235b186f37ad24fe6b

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