Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a058b293851290…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 06:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 029dcd0a1ade20daffdc537362d6d615 SHA-1: ab5219f9182543292933371b3945d23ac46fb8b4 SHA-256: 60a058b29385129035cdbcd55974f1cb71e848c25c41b9370d9b4cbd4e087a1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, despite some being marked benign, contribute to a pattern of redirecting users to potentially harmful content, consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://opusincertum.it/userfiles/files/xazexigin.pdf In PDF document text
    • https://poulinstrapscan.com/userfiles/file/93491806957.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/larewoxujupetapexamo.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/zumujomaradel.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/kuvizaxadupokazofezijamo.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/kubizazedomozetizoxud.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/98635896301.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389ed2b9d73---zusajiranobeza.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/97723713338.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/gifiluxirubexofasa.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b8f3681b83f86b3186bdcd91fab86eb8/vuriveguxogolurexobifa.pdfIn PDF document text
    • https://everestart.com/images/stories/file/93901648736.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/97547721396.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/juzuvasibirumumigolu.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/64728942970.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/32783785152.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/vekefafewitefegituku.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/21095864110.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/mupepotolijovabiz.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/gimajusag.pdfIn PDF document text
    • http://eternoohydro.com/d/files/zinidagogosava.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/wulisute.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/28266427101.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/6073063328.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb74e0a081---93456822079.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/fakofakipolatuse.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d3a877700---xuwupinomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=harry+potter+and+the+chamber+of+secrets+watch+online+with+subtitlesPDF 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_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 18524 bytes
SHA-256: b94d575bad72d1db8df929bcca92c32c5a190017f087366b7c3cea64e086200f
font_01_sfnt_off00010ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 11316 bytes
SHA-256: 61f00c3063ad1b35a7846445c3240e5fccafa47f5857a264f92b3789e5b43954
font_02_sfnt_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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