Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff384f3995846ed3…

MALICIOUS

PDF

78.7 KB Created: 2021-09-21 20:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e76645d80d65de5a841693570b7d2e8 SHA-1: e286bfee9122e2b1fe560f9e291b7e2fb932ac97 SHA-256: ff384f3995846ed3dc45866f68593287ac9585c8133d5442040167f1f77fc0a9
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a visual download button lure further supports this. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=app+cloner+app+cloner PDF link annotation
    • https://speedwayinfo.hu/uploads/file/21127514221.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/22912656470.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/pusiturivowivusipepi.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/90130152721.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/sokesijudirajivolumoxejan.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c96133af3---tenixi.pdfIn PDF document text
    • http://altinay-law.com/images/file/41542412583.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/3797606644.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/nobabugubebomi.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/91724504404.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/lemomofitezogudegav.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e91f2cba---68469492225.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/bumozejuv.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-13/20210913150419415620.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/1167312385.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/97533447408.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/jumixuguwazexefinurofized.pdfIn PDF document text
    • http://halmar.info/userfiles/file/47043757017.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463a2b78a27---97395923981.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131da1d253a3---fuxisemaxufujobawakevivef.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/dodazemonefamekoruwirega.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/80245426770.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/30195803682.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_off0000d2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 9988 bytes
SHA-256: 951386a0c845348ccd28870f6a4399796a0192d93ffd2255a7942f46509b7eb3
font_02_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 17192 bytes
SHA-256: 759345e9e87a79ed443188dac8cd10fb5f0803e681169de244037e85eae9dab5

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