Malicious PDF — malware analysis report

Static analysis result for SHA-256 816b3ba6a5eaf51c…

MALICIOUS

PDF

64.7 KB Created: 2021-06-20 09:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ee3fd964ee211040d173943364eab039 SHA-1: 9cc484803dbf07865102ba60c3c01c4289f7d20c SHA-256: 816b3ba6a5eaf51c0d5ae3189c040fbf40820dc2e089bbb97028920f6bad48be
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa9i521j0j3sieolguqihajfom/508836223.pdf In PDF document text
    • http://liubeauty.com/luutru/files/naxokawaravezonixetudir.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/ff6d993ad878278cc9bd6fcc5e9d0d0c/27600896708.pdfIn PDF document text
    • http://aimic.com/userfiles/file/39919460224.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a8af555ac---sawujenugituzonuzojo.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/xanuxabip.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/87928868322.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/90408143482.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/55232032001.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15daa0b1c---bonovetobon.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/36198202458.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/65782435355.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vebamoliwebaxasexale.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/zofewireladodode.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=passive+voice+test+multiple+choicePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1D 5140 bytes
SHA-256: 6dbcd9b52db81302489321bf820b95308d174b486a93495433f5ee48c6044aa2
font_01_sfnt_off0000d07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07A 10908 bytes
SHA-256: e6fa064bdfef5eaadbe5128a63ee6b2bc25c89483a2d7f71ca9ba52b966d1e3a

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