Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf394c30e5a2c68…

MALICIOUS

PDF

84.5 KB Created: 2021-08-17 15:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e1eb1b78d6c0a22b9fac1a380bfc0dc SHA-1: 1d45dfbe5bf8511275f20181d1bdcb6224c437fd SHA-256: 8cf394c30e5a2c680e5379c1ba310209b46607fb763c06a4c31f267ef1e67e9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user interactions, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://catamma.ru/uplcv?utm_term=bomfunk+mc%27s+uprocking+beats+mp3+download
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/93050505686.pdf
    • https://samsungdvmklima.com/upload/ckfinder/files/fuzasetipigenufovenuji.pdf
    • http://pro-elec.ru/ckfinder/userfiles/files/xofoli.pdf
    • https://branchennachweis.eu/userfiles/file/waguvejaxepoju.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/28bf434e717ae6bef8e768710fbb31e8/rosopikowujuxenuwogileno.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e7208f5ca8abfa92779ffda2b4469c5f/moziletezetale.pdf
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/84566804257.pdf
    • https://samarpanbharat.org/trila/userfiles/file/32872366768.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16091585979c0c---fopifugaz.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160863268b6b98---pexerunotex.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05d3bc30fd---39917684645.pdf
    • https://ecole-anglais.com/upload/files/divivutisavotuvoge.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc08b2d4096---3904683975.pdf
    • http://aitrans.org/UploadFile/file/F1202105121051182775.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7hqkuaeblqs3d3s0ojfm8mnnq0/15966471130.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/9664936907.pdf
    • https://sanaspinler.com/calisma2/files/uploads/91931220967.pdf
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/dupafakenimamijewizovopul.pdf
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/96095602394.pdf
    • http://smflow.in/admin/uploads/file/wamabanodogelazog.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f1371f892---23404590049.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160781cf556bb3---zizavu.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/k9o096jq8ah01i8ohttmb40jpi/bajexudupag.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/90f5f36c63423eb90e88fc9e47c85660/nigepexaxulasar.pdf
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/xixanunulu.pdf
    • http://rauvuonsach.net/images/uploads/files/vapimajutuj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d521.bin
49e11367786bf1d1aeabf19159d41996c52c6a10ca4eb5816550a24123d7092b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD521 18972 bytes
font_01_sfnt_off00010565.bin
d1ce53d1c2c90076a7701b84a7e1a963bd1996a60f01b96167dfe8d6b3994f2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 11640 bytes
font_02_sfnt_off000120d3.bin
f86a68e5213edfbb67c834e237331567d515831450a64d594a7d0ff2d48a3627
pdf-font-stream PDF embedded font (sfnt) at offset 0x120D3 2348 bytes
font_03_sfnt_off00012aef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEF 16792 bytes