Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1e69124c425a6b…

MALICIOUS

PDF

87.8 KB Created: 2021-07-31 02:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53c8087fc4ccdac5c41328147199f670 SHA-1: 13e45a34448fd2ce1d530a33eb31eabd3546b387 SHA-256: 5b1e69124c425a6ba999fdc943667d3be9585fb6b747661643f859c160ef8f6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The embedded URLs and link farm heuristics indicate the primary purpose is to redirect users to external, potentially compromised, websites. The document body is heavily obfuscated and unreadable, suggesting it may contain embedded scripts or exploit code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://nomylo.ru/uplcv?utm_term=c%C3%A1ch+t%E1%BA%A3i+li%C3%AAn+qu%C3%A2n+%C4%91%C3%A0i+loan+apk
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/sgcg282ptudfam0rvf1fpgpu9u/bokirulapokulapu.pdf
    • http://connect-event.fr/ckfinder/userfiles/files/tadoletu.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/k5m0hk7jnahkub2sk1jglmniq6/dakebuguremulijewofol.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/36164d6010eb62ccb5945b47acaee1ba/30289692857.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c263c47c08abb93da618c89501f64aa0/4839023446.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/0ajutbe84ueu21i79iog578198/lofejudegatop.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/6f7a2dfa9976b0a61221d05d9377809c/pofejut.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hlqm0ccd6gsa05lncscgo8l1t4/xofirumobebemajasa.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090042de0141---rizudiwutodimepuzilav.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/kpi1sb144p3nhbi0mcn1602u16/dadelubaxebuje.pdf
    • https://tylbm.com/Upload/ckeditor/files/62808572786.pdf
    • http://buergerforum-tirol.at/file/padagutavigodavukubese.pdf
    • http://adria-ex.com/images/blog//file/gogepegodafuto.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c95d263bbc6419390cd2a0be8accaadf/bosevagowofesam.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ffff77ef5c5---56135331999.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/25343704329.pdf
    • http://assytekservizi.com/userfiles/files/nalufibexozen.pdf
    • http://kapsalonindex.nl/images/uploads/76043468390.pdf
    • http://doyen.cc/images/upload/File/7749258625.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608284ad4990d---wumoxadogagubofedug.pdf
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/niberimoridewig.pdf
    • 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_off0000e0a2.bin
54879a9ebad73250de9b9c977f216972e910c64b7a9b4caf6dc6ac68fbd0c13b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 11544 bytes
font_01_sfnt_off0000f9f5.bin
9d62fdb117f2a189cd49e385c3c9cd5ce257d3b14ec5ec254a9a319aad22ef62
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 31904 bytes
font_02_sfnt_off00013747.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13747 16792 bytes