Malicious PDF — malware analysis report

Static analysis result for SHA-256 4435e219fe632d57…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 07:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e921629be6c6f95a2fd2b297f7ddb6a3 SHA-1: 6ed06f4e4bee0e83d22c41a3292be22688c124d0 SHA-256: 4435e219fe632d572b2fc166dd97dfa581074558b99d3e82d49bf42ceac1ef29
96 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed for SEO poisoning. The presence of a URL with a 'minecraft free game download' UTM term suggests a lure to trick users into downloading further malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=minecraft+free+game+download+for+mobile PDF link annotation
    • http://leylasuren.com/images/userfiles/imagefile/busosaxetesozoxavis.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109182054353259.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/wewofa.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/45829095352.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/joruzosetidalafuru.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/85753830578.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/misutiwabi.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/zosuboteborodirad.pdfIn PDF document text
    • http://millecolori.it/images/file/dojevolodusutejejemobe.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/39751862576.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/ropumunurepapi.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ccd4abe89de0d0fc3b5033cc80a0ab98/zoxegi.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/xamutanosab.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109061320341071.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/rdj7hfdk9stiliruu06k551u24/15369596535.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/meborefuribika.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d32adfd1---vonufapifatiru.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/14785952521.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/4365945413.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/muvumenetebuxuvasabak.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/woxozavovi.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/55060108547.pdfIn PDF document text
    • https://termofriz.rs/files/59406435626.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/98037377675.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/tifemeduvivigidi.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_off0000b963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB963 15864 bytes
SHA-256: 38eb27306e0b89e78e7fffc302cea8ce2756270c5d91dbe269f35394977aa841
font_01_sfnt_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 10872 bytes
SHA-256: 38ce09d4bed2bad743b9f49a6108e90e1c8ae9dee7d644da7781ec914df85b9e
font_02_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1