Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4e9d0d0552ea74…

MALICIOUS

PDF

97.1 KB Created: 2021-08-10 18:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6fc961d55086167e758c6a95053accde SHA-1: aede384ddbef253a8b9e2ec9dad7e8a9f1fe0835 SHA-256: 5b4e9d0d0552ea74fa92a023f4b6c4847836f34378c68379c76c671b4a0ab311
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised content management systems or disposable hosting. The presence of these links suggests an attempt to direct users to malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://brenno-tojestto.pl/userfiles/file/38041324745.pdf In PDF document text
    • http://azizolace.cz/images/file/92552516114.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2a81684e3---39435052408.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/nuponujemezut.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/87959374135.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/63272825768.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/wusisasawupejefege.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/wolujejujimumesubodegige.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/27213980656.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/49731344849.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd987bff78---kojisiwutipijatok.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f4aa11ebd---penorizipokujepudubawaxaz.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2d61664fd081ae2d4070ed7dff919034/nomepeneluza.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/tufexopiz.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/redabuku.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093219e2f0c0---69341688227.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/litelemipetipigojeg.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb9db81d1---50743963082.pdfIn PDF document text
    • http://tcihk.com/userfiles/zedixakurodefaro.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/28387524608.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bddb4ec96---wujirabovus.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68cd1375c---liduvusisimipakasolis.pdfIn PDF document text
    • https://papiratisk.cz/soubory/42981717617.pdfIn PDF document text
    • http://odumakus.com/uploads/files/60239898858.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/wuxumarekitaxerazifibage.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/95116001524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=lesson+3+reteach+surface+area+of+rectangular+prismsPDF 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_off000114d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D8 11156 bytes
SHA-256: b7164428e6819d74ca1b41f5b0b53fae60c3d2da88a50356011420aa9b0cf8ce
font_01_sfnt_off00012ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC6 17672 bytes
SHA-256: 602e6ca47222a5e457bea7fca9596c87bebd10747e9e5b221f61e00b1596ad16
font_02_sfnt_off00015d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1