Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dee4379855da13a…

MALICIOUS

PDF

94.9 KB Created: 2021-09-02 09:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b48b9e3f7b507fa861499580dc6ab75c SHA-1: 4237f60af5853e9837d4b8d8d13e633bcd624da5 SHA-256: 1dee4379855da13a49c92273e0b474c998b23777a040cbbc617bab7661c5ddb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The embedded JavaScript could be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/c1i7fvo81pm3fki62sqg5lmjqm/waxesikosegumolitewuzufe.pdf In PDF document text
    • http://extracam.es/app/webroot/arxius/file/jodugorenakunapizuta.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/87130dbed5ba63fe2f63841e06a84d10/42568633566.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dd6485fae---kuviwopasebezuduzivedi.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076064d8a14f---93062143994.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c142b9535---78109040617.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/vukogidopa.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/xumitaw.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609757c023e2c---72104745590.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/tavuzofokowo.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/48882501613.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160729defabdb0---89370940867.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-11/20210611080015897385.pdfIn PDF document text
    • https://tepihtrava.rs/files/70232205108.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/df70198b1f4a50b38273b4ada725ca4e/lawipa.pdfIn PDF document text
    • http://healthywithhart.com/res/file/28529968279.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/38136589642.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/zafonofepefaz.pdfIn PDF document text
    • http://cjatkinson.com/userimages/36386122223.pdfIn PDF document text
    • https://senhewood.com/d/files/70048054360.pdfIn PDF document text
    • http://fitviewer.biz/files/file/jonirowes.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/22ae4ad3c0520bbfeda529ab686e7c62/mawumexuzumuke.pdfIn PDF document text
    • http://gibisch.com/files/files/42493505578.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/628e00e3dc86ef22382c593122d86149/rupisak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hacking+for+beginners+by+manthan+desaiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 17244 bytes
SHA-256: 34712488007f8410af886a8dde259a99f79e1c3169a37b8d9fb0d0e18a8202b5
font_01_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 19760 bytes
SHA-256: ab7b0425408f60d767a8ad71237dce9e2521c2298c6374031f47266a3741b9c9
font_03_sfnt_off000152f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F5 11216 bytes
SHA-256: ca65ec79a0151e4b93e47e8c64809c83c168806faf726ef9e9e3e12e76d9f1af