Malicious PDF — malware analysis report

Static analysis result for SHA-256 815324de72d9675c…

MALICIOUS

PDF

77.9 KB Created: 2021-09-20 19:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35b1bb1dfed482b579845dc1b2fc251e SHA-1: e8ddd63a5064cecd0203a9cfaf8c66b369fdc513 SHA-256: 815324de72d9675cee28227f6a40dc0effe28fb2e42d08ba14de56373e7c3990
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. Heuristics indicate urgency and download button lures, combined with a high ML confidence score and ClamAV detection, strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=shadi+me+jarur+aana+123movies PDF link annotation
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tezifusifadega.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/12724246722.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/lafeleluw.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/nikokisiwemi.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/zopiminufomipolebumewaxar.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/70919991142.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/64234725515.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/dotinugevazenabatem.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/kokovadek.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/rusosidopekalulune.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/575b892cc34bceeef540251146541321/4283600667.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/f8e77qpcg5ianj5am3s4pavu9v/1039290527.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/71204399495.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305813e7873---tefofufizevekesoragema.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/vepaxa.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/45953462297.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece79691b4---bemozelusosujosokalogun.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/dp5bhvsh06np4q8jpupidfaf5f/jizukewudek.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/69867417921.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/20574736396.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133be87487ca---80064972255.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/85045769766.pdfIn PDF document text
    • http://med-os.com/user_upload/file/62224415257.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/15169206616.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_off0000c6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F7 18692 bytes
SHA-256: e2bcae40ce3cd3baec552603b4f1217500309b3d1e5c42ec07ad512e21f20142
font_01_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 11084 bytes
SHA-256: e63ab7d7b504a9fc343985ec0ff29195b8b76deef802f17903a65683f18aab37
font_02_sfnt_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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