Malicious PDF — malware analysis report

Static analysis result for SHA-256 923881b25b26359c…

MALICIOUS

PDF

86.6 KB Created: 2021-08-15 01:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb6327885c551f33a86893f0401936fb SHA-1: b5bfc686dead85eefe1c75201067f6d38c53c310 SHA-256: 923881b25b26359c3b5dd02969013bece61515e3e5a51a7347c5abda5940f855
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised websites hosting other PDF files. The presence of these links suggests an attempt to lure users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/48b556f01387b81cfce14098405faa86/romakulotizewerune.pdf In PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b051240e850---dinevezakuwagipiror.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1282f1198---gepunamifam.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/snhmgf976akqoobgukib52a1no/54261969272.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9c215eee98d64923aeaf7450b8671bfc/91355910505.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16079f4e314f63---zudanepimir.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/regaregemuvusejorip.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9218b1e649---87668690684.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210521134334_0xf6rg.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/39090989825.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/76225992324.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b28a09cc4---64277601079.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/51608137430.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/f9826814be1ef3817b62ecb797d7eac1/6829363986.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/540cdf6037a61b6203238cd9ff97168a/nunadesutoxan.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/goxuwerojekigizizu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bef3eda08a---95154091887.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/99255614355.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/xulikosaf.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/6t9ac6kb89qe7te52cittnuruu/6605853858.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/mikawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=different+types+of+paint+brushes+for+artistsPDF 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_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 10764 bytes
SHA-256: 4a136528c7cb253d5d07308d072c325275377f6be1fe0676392b191dfc53e0d0
font_01_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 17036 bytes
SHA-256: c07a661632491125ce4b25512c901f1a6a4593a82db627b3db9becb09cbfaade

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