Malicious PDF — malware analysis report

Static analysis result for SHA-256 b650b9be4ea583e8…

MALICIOUS

PDF

119.0 KB Created: 2021-05-10 04:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8d3d159694e78052b07c3229cfb40aab SHA-1: 91b1207668d9a4d1614b73e4106309ab0d583f6a SHA-256: b650b9be4ea583e83347e0ef3d01713b0c8ceec181c7d35bfacc973abb3008c4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially malicious external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608a574992a3e---sivaresaj.pdf In PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/158a96d255b2f27877bb46529806c148/rewekebuguken.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/if9jc8l1r8vvp25si1biijjuti/tigema.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609091261435a---4641162208.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/23ce296fbd1a95177bdde08da9269cd3/fepodot.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/defoligax.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/53396858117.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7acbef059---nanexiru.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f93c6cf85---28847895070.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/51185ac31dc24d1a1647c260dbfc27e2/27536345887.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/gsh99kebanckl3tfch4g1v8fpk/50467789563.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/b69fa35d71598dc61a2d5d8491f5c9c2/24568465596.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/341472c87d23c5e8e3c1d5dc97d877d5/besekalobex.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/54ktnf2dc4a64gfece1gv8g94b/veragaxumapamak.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/a4a7c720dcf467a9048bb0de56b6adb4/94295253745.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/718b049bf6541e1d8ee7c0af34fb39fc/disurijarexulimazuwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=orbit+er+portable+%25D8%25AF%25D8%25A7%25D9%2586%25D9%2584%25D9%2588%25D8%25AFPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B94 4800 bytes
SHA-256: 2b44fe847336d18e249e001b81b629f36b6c7d91a4ceb61d9bbc1378ef01e2a9
font_01_sfnt_off00016bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BED 11136 bytes
SHA-256: a422652ec0beba1278cc988e1cd1844afd3aa1437be9827602e2c46b34725598
font_02_sfnt_off0001925c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1925C 16496 bytes
SHA-256: 25fac1f4d76e901e905d96b2d5eda01e85ce5a518ad47323f9aad8b2555f9010
font_03_sfnt_off0001a909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A909 20536 bytes
SHA-256: a5391df13c29e7d84ac00d5e3d41b358d9e417a5b135ed1bef7e5c710678822f

Open this report in the interactive analyzer, or submit your own file for analysis.