Malicious PDF — malware analysis report

Static analysis result for SHA-256 058fe055b37cee4d…

MALICIOUS

PDF

83.7 KB Created: 2021-10-09 03:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2b365c2710a3003db3f093bfd2dee71f SHA-1: 602cd679eac99c89e4cac41ceb03fb4cecbe68f9 SHA-256: 058fe055b37cee4da84e5f1462751c1c370f2a226a4abea553780de4b9402fc8
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous unknown URLs, many hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious link distribution.

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://prota.ru/upload/files/27075827824.pdf In PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/71855675991.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/94702146976.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/81447171320.pdfIn PDF document text
    • http://idcla.net/upload/files/xenabegakafubami.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/34578690626.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210912_181247.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/govobogezosunapozanuw.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/86962031043.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/jirazokizuzomepof.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/rulofexexuzutoburizodik.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/nolutuv.pdfIn PDF document text
    • http://alptw.com/images/files/jigabefefuwaxidu.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20211007013654.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/0afovbrqa1n9ts3b2qd75kjr59/81225162779.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/5515681742.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-09/images/files/diner.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/rexuvodusaxiritilezotebo.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140302829952---leravobijorugebi.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/pafowizovepoxinopuderem.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/fe43a1d8c932900f6903f2191e519494/2774193312.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/98370500855.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/nipojinun.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bdo5fqh0r14ri9flbvrhah817q/59779094349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=greek+gods+and+their+weaponsPDF 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_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 10840 bytes
SHA-256: abe88ea3b8267e1a518c9f4742c58fb61e30cb41e82636cb8b6fbdd095f009c3
font_01_sfnt_off0000f810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11022 19000 bytes
SHA-256: 02a4a6800f3414d0e30ef0f16928c78306ec401e82551c61438f48c4ca05522b

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