Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa970514064e4afa…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 07:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74a8ef208963b919e401f79e94ddbdc1 SHA-1: 03af2c7f1a2c160d13f1f66ff12769232df21172 SHA-256: fa970514064e4afa63d492db9c43eb0613af6cc5fb8c605df89b33aa02fdc3f3
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, which are likely intended to host or redirect to malicious payloads. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://otoform.com/upload/ckfinder/files/livepimuvibikimobe.pdf In PDF document text
    • https://vinasimex.com/uploads/file/nuvikododiluk.pdfIn PDF document text
    • http://gaudi.tw/upload/files/diwijebezigif.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/fiwalo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161317b05686af---fokogovomisotizowamug.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d619805254b1ba8372d4b460eca24a23/kubosiv.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f23eb365c2---16133516410.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136306ac4772---perewemusajixobeweke.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613786c29bd85---fikafezuzizetumo.pdfIn PDF document text
    • https://edarky.net/data/file/dezatifolafabejeramakuna.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/43925884742.pdfIn PDF document text
    • https://novitas.ro/files/dabezepugetojoz.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/22313059545.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/pakiginubimisugatovowe.pdfIn PDF document text
    • http://fpole.ru/sadm_files/pidumoke.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090219564486.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/rafebepasiranafefodid.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/9671602411.pdfIn PDF document text
    • https://haidangpc.com/contents/files/29294607567.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614016eae0ae4---4360037511.pdfIn PDF document text
    • http://sushibelovo.ru/files/juzevoxidanupenut.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/todafumebozapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=critical+ops+multiplayer+fps+downloadPDF 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_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 11112 bytes
SHA-256: f5cc98be7dad4d50c6785576514993ad9f114073f7fc94c4654dbb04929e6592
font_02_sfnt_off00011cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDE 17012 bytes
SHA-256: 38fcd16b43df246b5db3928a2792a6e63a924830b20c1b24230fc4abf0bdbd21

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