Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34872b0116ef48a…

MALICIOUS

PDF

83.4 KB Created: 2021-08-01 19:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0fad9f679e63d29f9b417e83ea1a1e58 SHA-1: 956aab3314b43d5ad1d97b0e9d89245b9b924371 SHA-256: b34872b0116ef48a8582261b311b6789966eb25dccde191232de53af34aa46f8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to deliver a payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b071e090cd3670404e86f9166ae535eb/lixemidoxijobibozorod.pdf In PDF document text
    • https://bloomland.com/sites/bloomland.com/files/porogatejadowabixakutobim.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/31180251861.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/netoladekeze.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160924250be806---54336539666.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/91363158f4e206a9e1a6a29e7deefbef/59806530228.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/lixogunumesefudoxodibo.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/mewiwam.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/mesagofidibopibitufed.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/lisuj.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/rabanafakulasogulabumona.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160911e51730cb---30070086963.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b6e6c7c5c---vunaditimet.pdfIn PDF document text
    • http://megalaserasia.com/upload///tofusurufakawadolot.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/79820419291.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rr6c6l19bd93r4qcjj06m8bl56/59899009998.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/lusawiboxagadirevuki.pdfIn PDF document text
    • http://ahchala.com/img/file/19558394790.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/444a7b1fac958956d6bf2666aa2ee42b/jaxupelevijawojalag.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/dekin.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/42390323850.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/cadbbbf29be7ad20e47ece68d4b221a5/kudovasubajebodedofi.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/95898334275.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bc951078748---vowefapigubuxibizu.pdfIn PDF document text
    • http://fxmeat.com/upload/file/b60372a091d12d87826d469fc14c0181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=tecno+12+18+vistas+de+piezas+2PDF 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://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_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 18120 bytes
SHA-256: 9f42dac6331546160b73c67b6956e759423a6835452ed2056102f495731a629d
font_01_sfnt_off00010cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 10832 bytes
SHA-256: d006f45857a82fe18e0c70d0c67587c0fae4065469840a1ec20855e6a5623279
font_02_sfnt_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1