Malicious PDF — malware analysis report

Static analysis result for SHA-256 345f0fbba1e82f60…

MALICIOUS

PDF

84.2 KB Created: 2021-08-11 10:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c74ce88ff624c4811fd611977e3da66 SHA-1: 0e34e193152a0a9dd9252c4109f231c041859ef9 SHA-256: 345f0fbba1e82f60c3f09be37be35dca3dfda0bdd898f09787361df9f0c61c70
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be directing users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=how+can+i+get+a+copy+of+an+incident+report+at+school
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/048c54354ad54bf1d42cc0e79792f5f4/91603049620.pdf
    • https://topclassgreenery.nl/images/file/3091189268.pdf
    • https://www.studioline.ie/ckfinder/userfiles/files/pedenetevabakijogogaki.pdf
    • http://hyundaiokla.com/uploads/files/92892329788.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/708f38c2d3880718ae9f2aa964aad63d/89960629256.pdf
    • https://casabresciani.it/uploads/file/69293304442.pdf
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/95633017765.pdf
    • http://premiercontractinginc.com/files/file/besugulesuvelelazaledup.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210629_44D4605DDCB71E68.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f84f4ae6e45---57650263551.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa19ef6f62a---tajisababamo.pdf
    • https://maximatrimony.com/ckfinder/userfiles/files/tidagategi.pdf
    • https://jagamimpi.org/contents//files/madimuzodefezevo.pdf
    • http://jnnycc.org/userfiles/file/43323036281.pdf
    • http://bensonlandscape.com/editorData/file/80745092083.pdf
    • http://blankheich.de/images/uploads/file/dolagevemo.pdf
    • http://reutlinger.pl/userfiles/file/litikokovuvewaro.pdf
    • http://georgekoldun.com/var/upload/file/jugaleguku.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/ff25828123f158f17dbb55bd74baf2f0/61288736551.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/gfud6jdaim52sii88v5knp4772/vuxurizudamozew.pdf
    • https://almuhja.ps/ckfinder/userfiles/files/powujekuxaka.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/8qimu9dsffdgtkdjnbod9f7pv3/dufinitamoruzaxepi.pdf
    • http://simonhoirup.dk/userfiles/file/2819395413.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/tu03c82c5nmqh0fd3dm4qca38dld9lbe/62168943695.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607636b900370---43665220732.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63e.bin
ec05abdad0de3e2f4c1b2373d9f7de3178d3c029a4125cd56a1d1b3c0df3abc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 11092 bytes
font_01_sfnt_off0000ffdb.bin
4dca7fe0b94e564f20679071b09ff8c3a09264869547a6ada6e5832df7a12401
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 16496 bytes
font_02_sfnt_off00012a4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4B 16792 bytes