Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3c6869965ad496…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 19:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e87afbe8b990e777415951dab95d8bb3 SHA-1: 4718c732da457422fb6413f2bedbeb09d2a9d636 SHA-256: 4a3c6869965ad49643a503276797a64afd71afbc793e0129a58d280ec041c95d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggests a phishing or malware distribution scheme. The document's structure and embedded links are designed to lure users to external sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=download+x+force+autocad+2018 PDF link annotation
    • http://daeryuhealthcare.com/ckupload/files/virekelim.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1291965ee---13448019212.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6130b4cb378fd.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/54637074eae3fa566b223290f7805f85/beloxumadizup.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/70062982756.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9bgpr29c87h2jm9dvv8768cm0b/64304843162.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/79742972405.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/6810221026.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee224027a1---76377828267.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210914_B7D49E82FA420F4D.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/fasebikixenovit.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/18355244495.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6ee214ad---fitowegobobusozu.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/61160703026.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/vexowoparox.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/raguwenudonovo.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210906095841.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/13613015092.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210901210523267853e0yrl22vs4di.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/besijuv.pdfIn PDF document text
    • http://rayer.cn/d/files/98636638853.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/85318267980.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/nimuxuve.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/93398794202.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_off0000c50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50A 11000 bytes
SHA-256: 45807f4089fcdda298b65d12ab3645d5ef32683b8f6009ff07dc95ab4bd1320a
font_01_sfnt_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 19420 bytes
SHA-256: 2134ea7b365a3371d15e726e1ba539983cf45697962a37b673b1b76dbfd516df
font_02_sfnt_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1