Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d18eba5e1bf2359…

MALICIOUS

PDF

82.8 KB Created: 2021-08-19 14:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 004438d6374722d00e7d26c82bf06fc1 SHA-1: 6eef0688862925d19bca7ea59dfba099dc1e870d SHA-256: 4d18eba5e1bf23590bf2043613f82d3131ec1a75ac25525df09e7d1f4ed83c6d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites hosted on potentially compromised or disposable domains. The presence of multiple links to files within WordPress plugin upload directories suggests an attempt to host and distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cca6543871---tuwesilumubuluzomaduz.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b793583da19f59cc948254eb5e0a9958/pupusinujuko.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/supidezewo.pdf
    • http://zlato-stribro-investice.com/upload/files/suzulekiwiwawonozadazel.pdf
    • http://ezibra.pl/upload//file/97727891340.pdf
    • https://allcreaturesinc.com/files/files/lewiga.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa7846a1f2---34696537200.pdf
    • https://mamotato.ro/userfiles/file/nexaruzujonawosolitumov.pdf
    • https://genegurumiraclehealer.com/userfiles/file/18011187991.pdf
    • https://whiteplacard.com/UserFiles/file/bogubezinobus.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d93b5c1d76---80113908912.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160999b02b37f0---95374278772.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/e21941bc64f3a1da7c4804382034d3b5/23929710366.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/pozewoloxovowofixefusileb.pdf
    • http://pappteam.hu/userfiles/file/kugenuzexoxirezowikepire.pdf
    • http://kochamsushi.pl/UserFiles/file/51426769637.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d5b5e0ecb---56417011835.pdf
    • https://eltonltd.ru/sites/default/files/uploads/fetijuvuvobuzexabese.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a9d872b92---75655417269.pdf
    • http://rsti.biz/files/fck/file/7275419407.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/7f040a4aee7aa9f5d3380821e2098a29/zeluwivim.pdf
    • https://pellevah.com/upload/files/59916591769.pdf
    • http://gps-tw.com/CKEdit/upload/files/20487298118.pdf
    • http://www.aqsclimited.com/EditorImages/file/61767311504.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+tiktok+dances+on+roblox
    • 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_off0000df24.bin
8edc44c9efad1b2637e34283f9d63fbf2fab4124c00dee37c14058691b6dd55b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 17088 bytes
font_01_sfnt_off00010c08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 16792 bytes
font_02_sfnt_off0001241f.bin
95e1452ef10e63770a11edeeb05bf8e8d33dcb0c974bbad07e30a6f6195d2664
pdf-font-stream PDF embedded font (sfnt) at offset 0x1241F 10956 bytes