Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d06fb0eb5da32d…

MALICIOUS

PDF

99.9 KB Created: 2021-09-11 08:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0752eaab01d8b81d4f5882cf0924d5a7 SHA-1: a02c1309388e41873f970ef94b0717f94a606819 SHA-256: b1d06fb0eb5da32d50faad3739d09be7ad4e32ec63ab33d76d0d000daa22b0da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript, a common technique for executing malicious code within PDFs. This script likely redirects users to external URLs, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which point to compromised CMS uploads and link farms. The ClamAV detection further confirms the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier clean score 0.1450

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.
  • 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.
  • 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://widepolymers.com/userfiles/file/46530083987.pdf In PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/9045hrvnaf2n1nqi8pgr4chsvf/33309168773.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/94690399315.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819d43ae8f---49624929254.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/352726758612f5c09be66d.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/neranarigalegogagasapaxe.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/22962966132.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/gopizasuvojugajajiser.pdfIn PDF document text
    • http://terrietanaka.com/library/files/51155530077.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/658926abfabd9248757a803717a06679/ladirusade.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/27289988902.pdfIn PDF document text
    • http://ctm.it/userfiles/file/22567668744.pdfIn PDF document text
    • http://lex.tj/img/file/povezuwezemerijibokepuba.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/93364777965.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/zinurezasigatafixenugotoz.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/53656695553.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/8132563656133b8eea295a.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/miresemapuzovot.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/030322302165.pdfIn PDF document text
    • http://soles2walk.cz/data/file/jitetoperadisaro.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/tubevu.pdfIn PDF document text
    • http://video-cycling.de/files/file/31850157412.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/darupo.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/11867391372.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/5762294335.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/62194523337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fast+9+putlockerPDF link annotation
    • 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_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 10508 bytes
SHA-256: e720321c4729fea585305d55acf1d29076ce88d59997c21b40c566d231501721
font_01_sfnt_off00013dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFA 19844 bytes
SHA-256: d29e712899b9440107f0e650457363dd7a078e7a842b227a1151e47d805df063
font_02_sfnt_off000171cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1