Malicious PDF — malware analysis report

Static analysis result for SHA-256 9918f85d0cb5f60f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-14 18:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 995f54b7865e04f839d7a37c1b8a8d45 SHA-1: 23da1b0bc4dff237322fb251541fc2eb35c19ea2 SHA-256: 9918f85d0cb5f60fddfd031965a50302c2c0f1bd7f63d079f7e633350c253aaf
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous embedded URLs, many of which are unknown or point to suspicious domains, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 http://speckrepej.com/upload/file/21742179016.pdf In PDF document text
    • http://yaqeen-eg.com/userfiles/file/saxoduruwobagivogidakanu.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/tonunujorotelekozamoj.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f83a51c30---parogata.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/61541573463.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/pavotajijifukovumuli.pdfIn PDF document text
    • https://slotpt2.com/contents/files/risajisodekubogegulut.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/tafikonomo.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/runuwatunoj.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/jomubemeno.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31b2a5893---6635844246.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/wenimuxevoraxosodokudid.pdfIn PDF document text
    • http://ergakiland.ru/files/files/29840411514.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/12204398282.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/3bc9ec67edc6a3535a1d2934b6d868dd/dizovanuzigodewururowo.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/16791963576.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/3696869502.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a6331d59f09b2c4c83594692bd3cfaaf/pemibarajomo.pdfIn PDF document text
    • http://unibox.lv/files/text/42526501628.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/rosisa.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/76479846309.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/bukajezelosibegezixizisi.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/17502354393.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/12586917591.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091306011152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=intel+android+device+usb+driver+windows+8PDF 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_off0000d3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E9 10912 bytes
SHA-256: cd62ec2f149956c403c9881faa5f3625313ee335d125c73d887fb6301ad873e9
font_01_sfnt_off0000ed62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 17508 bytes
SHA-256: 5b6777ee24352c53905a79c9bafbfd6e32ba26c24e7836b3127c664f25a2c4f8