Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabfd4407414b1c8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 07:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 62cfc3e11e8851cc6f8ed28f010cdf08 SHA-1: 921bdffd4b3db8b69b85c79caae2eab9f66f8dd8 SHA-256: cabfd4407414b1c8c5a822cdee8c8a6c756a0948729aefd827d975a975f6d6a9
172 Risk Score

Malware Insights

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

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, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://residenciasanamaro.es/userfiles/files/sefovilejo.pdf In PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/421d04d7c1a09df23e58ada648488e4c/43823311289.pdfIn PDF document text
    • https://seerupit.dk/assens/file/xotomalivunodaxitara.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/32186743802.pdfIn PDF document text
    • https://brs.jo/userfiles/files/bigijilon.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161320f9010368---bolinir.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/nojexirat.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/lizedinudobogufebeg.pdfIn PDF document text
    • http://szjg.hu/images/file/86165399806.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109070013318362.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/wixubiginozaguzomaborojo.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/pufepetisa.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/wolisukosedojivas.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ris75bdeddmaorjdcg0kh5tqd4/24849042711.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613230d3e1d91---sugudifurepilan.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210907_83061.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/97926605207.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/46274753948.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f38262a23d---zozejevavanaputewixot.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/polexomatuwu.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/tifenigob.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/4550720557.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/cd0208d56b3efadf51fd3b15b5e40073/dikilopowarufuno.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/tofonomuluwozewifika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=vysor+adb+driverPDF 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_off0000d12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93E 19508 bytes
SHA-256: 196e100586eff5903bb9e0ad8e671b2107e95a30a71694c4ad5fd9d2cf1b6efc
font_02_sfnt_off00011bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDC 10280 bytes
SHA-256: 4956bef2c1d018786001e19d0095a4de2aafddfed69a2573a3422d62ad63b6ff

Open this report in the interactive analyzer, or submit your own file for analysis.