Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb23b112b4446a3a…

MALICIOUS

PDF

87.5 KB Created: 2021-07-31 20:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20901534d29e14b32e42c5c3234cf61c SHA-1: 9e6744b910e68fe87e4a6ac09e7e4b81850c5a3d SHA-256: bb23b112b4446a3ad79dd4cdcc885b1fc4e22b1aab6f1294f59aaefc25da2970
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=how+to+connect+afterglow+headset+xbox+one PDF link annotation
    • http://szintai.hu/ckfinder/userfiles/files/vokemijaja.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f146cca941a---maralexewifanopar.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/bogarinofovujepu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fa1f13ff---99748725846.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/7098aea114f13960ab872e26b31973e3/bopufuzinegewukifejosirom.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/56759214442.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/60563211307.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/rusixipipakorazovux.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ruopuil6i7cu9f74i1rsiaaqpo/xufabafuxonusulavomeged.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/7de63695238e4710b3837ab2f8afca69/94520075137.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7u6qqve3ufirqq8gqhk20gq9l4/95001256174.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeabdd7c96---23007545705.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210728_0185B249D645DB6B.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12f059589---vedurimobajo.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aecf92adef3---67194929126.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/35132009934.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/xunawexujobivipugido.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/0943120cac77dd33bb86c873a6e8a099/bobizanadapuderut.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/filerosepadojonawexo.pdfIn PDF document text
    • http://k1a.ru/images/files/file/65034824926.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pafunufimugetivegez.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_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 17140 bytes
SHA-256: ebc5f97c72ededfc96907a5033ad7d1e26c58b8bfacbe93a5895a3b43e29892a
font_02_sfnt_off0001349a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349A 10980 bytes
SHA-256: 4b4ac1103b71b27be00662fc886d6b4415baa9ae1e9da30fe139a40df77a455f

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