Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d8c8e38be28667…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 23:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e07d22aab1f8196077e2e867d946de6e SHA-1: e2e2df4a2e1653110c784952fd55be7c6d571e08 SHA-256: f4d8c8e38be286675c1e2893dd29f43712d673ed6f844d208ecb18a0685cb7f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites. While no scripts were directly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://giftboxvietthuy.com/upload/ck/files/37888646356.pdf In PDF document text
    • https://areicon.com/images/file/zisiniwidezigonava.pdfIn PDF document text
    • https://onlinendttraining.net/files/37093186010.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/42303688899.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/vezaribedebirewaluxabo.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/rozezasulede.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca1668829---54160008407.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/64473433573.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/soketu.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/9497023980.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/313d56f7571537bcf447b94aaa819ad1/58859284734.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/14893444339.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb395cd0ae---8222876376.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/34928127635.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/xisosifara.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3b13656ad2aaece76ca728925462fc75/wibudumoxizapepazapuwogu.pdfIn PDF document text
    • http://nemochem.cn/upload/files/saterezatatotojugonuzufor.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/50454998737.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/11515968809.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/65618174637.pdfIn PDF document text
    • https://theurbanthinktank.com/files/rufuma.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/vegudesepeweweve.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/201352634.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/xepotani.pdfIn PDF document text
    • https://ms2oke.com/contents/files/94263186095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=adult+games+completedPDF 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_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 17216 bytes
SHA-256: f98c7e219bbd6aacb7add2f5dcbb357df7766be1c2c86eab79525c2a1b08d3c8
font_01_sfnt_off00010728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 10640 bytes
SHA-256: 77d1f546696a451360a615704888c4c638492bc53b93ccbef20281f40d12b0b7
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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