Malicious PDF — malware analysis report

Static analysis result for SHA-256 1154bfc353b7c19d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 23:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23907e5654977692481ae8a68e41787e SHA-1: 4c049f0957e475ca80e274e66e611dae9e0493e6 SHA-256: 1154bfc353b7c19dcacf1000e80d809f27761cac1792409af690b524be83db32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, 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 SEO abuse. The embedded JavaScript could be used to further obfuscate the malicious links or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://datavincity.com/uploads/ckfinder/files/balotakomotitexi.pdf In PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/muzejusavataligaxusixigek.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109020026547995.pdfIn PDF document text
    • https://khanikango.in/file/wedapukelolen.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/kilejokugidobezukisarit.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/11854220977.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feba3c317d---xalunavenololaw.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/3667217693.pdfIn PDF document text
    • http://nanopena.cz/upload/file/gamoresiripakadara.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/zebazoda.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/mipilemofobuwunaxe.pdfIn PDF document text
    • http://surtek.biz/image/files/20150318_001238.pdfIn PDF document text
    • https://shidoremicrosys.com/media/24407293221.pdfIn PDF document text
    • http://deltools.com/userfiles/file/56090378072.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4ead97fe---falulotowezufavowofineso.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/madafopewitasimobizexitu.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/fanewagepepapufuwo.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109020824053757.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109060634249391.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/r3hmjqauvo01td74dj33vnl260/zeseda.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/33869239916.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/luzoxenebonetedozikuzit.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/10485346610.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/48091410047.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///19796086216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=omegle+mod+apk+downloadPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/92456546104.pdfIn PDF document text
    • 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_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 20132 bytes
SHA-256: 7a661207baac1db648d8fe73fada1d093fb0b0ab4dda47db9f7b40d18a8df656
font_01_sfnt_off00011372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11372 10480 bytes
SHA-256: 6c77902242c01a4e52db45cf41238a3c6f32d3ed3b65be8e9306119eecfcb7e3
font_02_sfnt_off00012b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1