Malicious PDF — malware analysis report

Static analysis result for SHA-256 467a2697cc3b519b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 14:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f89fc09d4f19914e8701b3eaa5a030dc SHA-1: 3da78a90f293ebd158e6df7690c9abbf0fa89976 SHA-256: 467a2697cc3b519bfd96c9b17014b7241442f982b881822f9f12cd6544513e58
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/3bqaveq3mor7ar53toceumbofj/domuzakunoje.pdf In PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/rmk9e8nqms58nd5vg1c9k7jmge/fisasexan.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/67311794154.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/lejagarajedunujav.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/rofuviwegazopiwemesa.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/67336875274.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/8811096506.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/91037356638.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/50569521585.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7abce789fc---45385039672.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/58b38c5926d2d3fec2894eb24a726859/fadij.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/94194720346.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/21504172858.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/dapewevitelikifagak.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e14a64588d0---lejazawamilo.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112cebd3f52f---78274881652.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6c1c031a---lijudavojekok.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f5pi139heda91tqloegkeo6n83/36882352453.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/87803630293.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/pizanajeledesiwolajavesu.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/nulawamorub.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d23f872d5f5---xerelaselediji.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/6b552ce7ba0111f283007587fa28189e/wosenexizajaxonanulo.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/71392226794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mpsc+pre+2018+question+paper+pdfPDF 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_off0000e1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FE 20020 bytes
SHA-256: a287c260e9ef7097bdc08bee8d8e49c09d031d7e444840cb139bd77a99296a0b
font_01_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F39 11308 bytes
SHA-256: fa459caeac3cc9b8663760a03516f0b48be93be509a6b945adb8da18bf5dd020