Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c3515262e14c51…

MALICIOUS

PDF

118.2 KB Created: 2021-09-03 02:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 130b12732a4da8f91dd7ca082568d399 SHA-1: 2ba1c43d67ff8f37d1830fad328af3e52a4973cf SHA-256: 50c3515262e14c51ec767dd22c582d30fa3fdf4fc1fd271049b49bab73b91c48
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely used to host phishing pages or distribute further malware, aligning with common tactics for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://coretry.ru/uplcv?utm_term=solvent+extraction+principle+pdf PDF link annotation
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/69118df20fa2f63fe533010ce3b1cf7f/simotad.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a5a656709---42059370420.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/81219fdf559beea1ffc40172ff45b57e/kuwokilonukedakafose.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/jutid.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/gulukiwogulitikewimuj.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f30043af0ff96baa002f17d5982d62e6/13526236759.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608065571b74c---tenivamusuzajep.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b20b2d3aa74---67116923589.pdfIn PDF document text
    • http://hidramaco.com/files/files/97668037654.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/jesiziwabubofasikusoda.pdfIn PDF document text
    • http://newshop.jp/archive/file/83119965804.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/37718565545.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d7404269aea1ab88070957ddbdbd3564/32258981290.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/fopatal.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa87de94bf---73221375733.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/woxanapugezinaba.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f493294f28---42946902660.pdfIn PDF document text
    • http://cmtsport.com/pliki/16597559039.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6986e933d8---javad.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/0jlgsbbpge8da7vlvjb9uvnuaa/nufexomonegaxepi.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/34475366821.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/m6e8djfnd1pjrp2dh8lugise28/43803860372.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/98747056433.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_off0001694b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1694B 18708 bytes
SHA-256: 52ff73c8c9bae7dd5e64adbd667b39a29dec33db346b1f07f3bba0f312c4137c
font_01_sfnt_off000199b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199B6 10688 bytes
SHA-256: 53a42c2825b5346a418fad6bb105e3e8e6907f2367527abc5f04d0c515f34518
font_02_sfnt_off0001b263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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