Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed8c53bf9e6abb9…

MALICIOUS

PDF

99.4 KB Created: 2021-09-02 13:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 22ef7fe31fe05c9dbfcc41d97e357538 SHA-1: 0b22e52c1ebe4c4496f5b29cc2fa965d4c4d475e SHA-256: 5ed8c53bf9e6abb9e3e5d80c769f0540437ce1d2b8d41bfe50e5a731c85932d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites, likely to download further malicious payloads. The presence of invoice-related language further supports a phishing or scam-based attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://irlanc.ru/uplcv?utm_term=rights+of+husband+and+wife+in+islam+pdf PDF link annotation
    • http://topas.lt/userfiles/file/32737276707.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/42696296339.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a3ebe68e---lovux.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9ce8123b9---buxasopijixurefegodateg.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/cb3a226744b9c62573d0c48fe47d6d5f/mibexulatakibotowogiloman.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/78111753429.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/98788571151.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/rulizegupumimujaxe.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/lofujifi.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/29613893449.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4527744a4---nitanumif.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/47762363244.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/dajikiginaxefebobu.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a537ad4be53---rajuxolorepuresi.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/12342782306.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9d8d648ffee121df0edeaa122f1764d4/rilejewaperun.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/nagurukidepi.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/53282354790.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/85934276130.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/bagox.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/mogogugeliwagav.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/97676567769.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/99010468777.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612db730e7706---37373062849.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/47048303897.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/49766017217.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/bigodoza.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_off0001150b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D22 11216 bytes
SHA-256: 629ff764e408e24d00ac947ba9ee8ee4bb7e515172c164c0281a6f2f4a377c56
font_02_sfnt_off000146dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DC 21768 bytes
SHA-256: 46c0f7f53b53014569a3159fa298822a27c4061f5de63cf1094b68888f5229dc