Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e499e26265667c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 17:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f1d2f197b2c413ecb3e32820fb66128 SHA-1: c0331fa358525572c0925985f5c670aa10d99547 SHA-256: 45e499e26265667c94a377c5df938d8ce34e03a04cfd840f7c8cea4ad2349f2c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=pdf+books+download+malayalam PDF link annotation
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/bevetulodu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606d67fdc8a60---28343138484.pdfIn PDF document text
    • http://staropolski.net/Upload/file/vudosaxir.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109011449437517.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9701609676---40188421319.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/nr8lup5a86s41d6qskq50bj46s/lexanivelumexerovetifiwo.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xofafimubiwu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/de524d58bde67d4a572878e862e57898/44705855729.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/tejegoxigu.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/vexexepidolopilogesobug.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/kefetivujitufijofimugugid.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/pukepisep.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094c89ce3360---83438021096.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/rupibovigazulijuzivira.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/dixokujuriwaj.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609260aa1eedd---merop.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/73211231259.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/7813762003.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e551e4811---lawelebulumiregodoremok.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/jidamukisa.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/63323397007.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/3de8639d6a910c5ed787ef6b4c45e9c3/82367534003.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/5fc2af0a74eb217cdaaab4caba7565b5/50903202911.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_off0000ba6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6A 19956 bytes
SHA-256: ae4f2282f9899d562a40e028c14083956278a7ef269fc47bee7488a6150ead8b
font_01_sfnt_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 10524 bytes
SHA-256: b2ec054c5fc353af4585f10ac643992c86775a3a57b0d37008443a5997be8396

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