Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b92e8110b842766…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 18:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 239822198a421ef8858b33d68a1988b2 SHA-1: 8fea0b2ce66601b9cf1ed91c38fd418d9e47b7fe SHA-256: 1b92e8110b842766bab514e112e317f471ee47fc52a0fd435bfbf358123a6f86
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting it's designed to lead users to malicious sites. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://riskhedgetech.com/uploaded/file/139403244260cec7d296bb6.pdf In PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/finegobawumigero.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3163f37d78---72784816352.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/cg63lsql7rveo4a556km89thm0/kibubuku.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160962230e0a2b---64404536810.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608feabc4e87d---vuneluzerov.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/19437672594.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28f8052455---67572810499.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/zitilonuni.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/fixobe.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083b972efdb0---7126020904.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104f7f4f3380---nefijumutixigim.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7809daa5a---gabixuguvilob.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e26b988ee---vonuziviv.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/48314475177.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/56285426301.pdfIn PDF document text
    • http://ippon.lv/uploads/File/raxujepotanam.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782835a3796---3840385915.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/maxez.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/78456129860.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/25529922342.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/51247885900.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/004d056c26c0edc738d742b9a1d2729c/92591918266.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/xojefabotawolubute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=computer+science+pdf+textbookPDF 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_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 18944 bytes
SHA-256: 42ef38b6edb55f90dbb98842994c99150e436056db8fbffb3828ab835477a177
font_01_sfnt_off00011900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11900 11036 bytes
SHA-256: 069431ceb64f39da737c515200b37be4c71f1ab07453b8d399be7e337e0c5aa4
font_02_sfnt_off00013285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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