Malicious PDF — malware analysis report

Static analysis result for SHA-256 182667c3486d220c…

MALICIOUS

PDF

77.1 KB Created: 2021-09-12 16:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01268bd039b0ad219b2b3b27a37e7f68 SHA-1: ea598e5d0a9761264a9bd38a42d2163c9e8b41de SHA-256: 182667c3486d220cd79fa3c2f2483b30117fb4475175814f273a10c8be92974d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to PDF files on potentially compromised WordPress uploads or disposable domains, strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://iktoktatas.hu/files/file/76719480817.pdf In PDF document text
    • https://www.thaiahpa.com/flash/files/27923551198.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e2f15ca8575589d1caa142defc7a9551/48673195361.pdfIn PDF document text
    • https://begili.com/uploads/image/files/kotavuzu.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/mebefibolomuwedavarazalok.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/fabamonukuzebejulim.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/35795639855.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/kibizogojumituzukukexi.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/penituzidimudulofeb.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/99840087566.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e1a5e5c02---71062279978.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/13054992343.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/bojefoziwulevowojukix.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/movavagodutul.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d38e07a50e---dadovafasudosokiruziku.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/nexawamoxebuvalafibapa.pdfIn PDF document text
    • http://glassick.com/userfiles/file/vuzuzetozateniluvone.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/61805293697.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/wilunu.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/lotuderuf.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/bogafexagate.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210904_5850192F3E876B12.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/tibosemutetarekotike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=chinatown+wars+apkPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/58261973806.pdfIn PDF document text
    • 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_off0000c3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 10380 bytes
SHA-256: 016205eb2096d3832002c84d30d693fc8481288d939e3c63c49af344b4395b05
font_02_sfnt_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 19764 bytes
SHA-256: a4b8e57315d176c321ce88c055c144a05ef6dff44755702d7b4062e311c4c217

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