Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e25820881bc186…

MALICIOUS

PDF

75.6 KB Created: 2021-09-14 22:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b44402cd5ecefd9a560a2d983a751d0 SHA-1: 2d2a039a5e94ffeb7ed4374fd6a3fd7395d4e87b SHA-256: f2e25820881bc186802328d302b2b7c2281c3edb2d573ab91808ae3c2e6e90d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pronobile.com/catalog/file/vopiduv.pdf In PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/70539315670.pdfIn PDF document text
    • http://iwort.de/userfiles/file/nesuguf.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/tidixuboxob.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d77be0dacb---80786096545.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613264bd61675---1983092759.pdfIn PDF document text
    • http://japhina.com/upload/file/peferegukuwupoz.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/tizulaz.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-10/20210910142537377720.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/xakutozibojazibabi.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/binofuranejoj.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322e2e3d028---pebux.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/17688038057.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/67919137487.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/kiwujejamowuwebukinem.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/kezevaz.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca03977a0e---88262549190.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d896bb014---45098313212.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/nawurabogapozeguze.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/16430901113.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/57172425992.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/54252515322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=introduction+to+indian+constitution+dd+basu+pdfPDF 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_off0000c18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18E 17768 bytes
SHA-256: 8145dcb8bfcfd1c03afcd6d46a22dd1e3f2b515bccaff80a1787887daedc7a94
font_01_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 10628 bytes
SHA-256: eab4fc0fecc5dadd7ec5d6a543d1e5c53f61ecb7878b8324affd5d877709dfb3

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