Malicious PDF — malware analysis report

Static analysis result for SHA-256 136622cb32777cda…

MALICIOUS

PDF

83.8 KB Created: 2021-08-31 00:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a989c18dfa4dc7a2ff7e46930ba95b4f SHA-1: 828f5bddb781423e02821e0017bd40fce71c78ed SHA-256: 136622cb32777cda54784d5204fc2605315ee93304f49893ca33f38befd3c68a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS upload directories. The presence of multiple links and the nature of the hosting suggest an attempt to distribute malicious content or conduct phishing operations. No scripts were extracted, but the PDF structure itself facilitates redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://fundreamz.com/ckfinder/userfiles/files/11223686172.pdf In PDF document text
    • http://alkanboya.com/files/file///5546712719.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/30672842180.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/59668537059.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/37815800347.pdfIn PDF document text
    • https://parkettworld.com/upload/files/33648477575.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/8227639638.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607957ff5acde---sogepetumolajixu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e3004eaed---14243056832.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/08c4ca544aca39c90cab3b8e9d6e3f99/mazosozujamem.pdfIn PDF document text
    • http://4darchitecture.org/img/all/nedamivezuvazenediwibu.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210814_D382862B8261F082.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/dinuripek.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/bajobazotomazoroko.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/20038422133.pdfIn PDF document text
    • http://kag.fr/userfiles/file/22480465635.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/52159558541.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/zalomijodazemuwede.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/ximole.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/70087265745.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/wosobemegudozawuj.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071af9972dd3---radofa.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a25a7144---68988149757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=use+your+imaginationPDF 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_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 10624 bytes
SHA-256: 0b48097cdf3c21ba740de8006a1322cb0049d55f5519c3d2e3cc1ff821af5dba
font_01_sfnt_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 21500 bytes
SHA-256: 35d4bd3558721ce85b761ea0c696f3064bfba2d601b893cb17df58c34274c63a
font_02_sfnt_off00012871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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