Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd9832c1c0d02be…

MALICIOUS

PDF

75.2 KB Created: 2021-09-20 08:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38ce9536eb78aa1206ce24c91918ae30 SHA-1: 63ff56a214fa2adf568b70a534ec4baef81681fe SHA-256: 0bd9832c1c0d02be47f9df6f02c46f301d252a11ecf9deacfef71b16de25e32e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://flomogroup.com/upload/files/zozusikazazamanawadapizon.pdf In PDF document text
    • https://gancza-yacht.pl/userfiles/file/xidabizevumafupowawemubul.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/teruxebomelarididinapu.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/94242209029.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/18599721866.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/61254942839.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/6831470524.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142c5cf4b3fe---surebigawiraxagifosukeji.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/45813728952.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/68777457882.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/33994980177.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/jonibudutoxarife.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/82115855909.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/vurixegalawabelelopujevis.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/80196131651.pdfIn PDF document text
    • https://bliznacite.com/files/70679773661.pdfIn PDF document text
    • http://medi-sen.com/files/files/4592769013.pdfIn PDF document text
    • http://15881588.com/ckupload/files/84939819202.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f3s7ldbht2m30737nqd785i3t1/82147294326.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132e698d46aa---tofobuzulev.pdfIn PDF document text
    • https://aayams.com/userfiles/file/waworiz.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/koretulagukumole.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/neganixobodexedunizagiku.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/6353707875.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/78200760504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=nord+vpn+apk+crackedPDF 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_off0000c5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F4 10236 bytes
SHA-256: c9bba37e013c50f508e78b83cac60208006ac397f4d29692bd402c8ba7e78ae1
font_01_sfnt_off0000dd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 16456 bytes
SHA-256: c25fe97dd054a762d03e4ec9a43678bc9dfd476bd9e718c3b5691b89a1d6000f
font_02_sfnt_off0001073f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1