Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbb437e2ff3251c…

MALICIOUS

PDF

92.6 KB Created: 2021-09-16 12:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2521183da21e4bb1091cebe4fa384d0 SHA-1: 5a748ee358b6b8bb35610625e12379c03c39fab7 SHA-256: 4fbb437e2ff3251cc7bfea9f6f6811949cd0119a63f19ccb371e50757dd066d3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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 http://www.ctnphrae.com/ckfinder/userfiles/files/241822967.pdf In PDF document text
    • http://hndgyl.com/v15/Upload/file/20219101325174064.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/37734288819.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/83876489852.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef6bc2b335---27291027615.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/dozude.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/14950115393.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/5025379698.pdfIn PDF document text
    • https://phm.vn/upload/files/40754117336.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/bb3846df3cf8c47feb0c60e06a0d3eba/rumurifitus.pdfIn PDF document text
    • https://ancoraeducacion.com/images/nugejetotojive.pdfIn PDF document text
    • http://isvpro.com/custom/files/31009140920.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/rodokuwemiriwujawalak.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d8ce5061---jututurajirepinunuto.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/dfe110e96e6096f902068a6944636f84/dovovujeduzujokokunumekid.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/29507303543.pdfIn PDF document text
    • https://primer-spb.ru/files/files/bapejurekutadajewus.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/xujarofixan.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/jomejajereluromeratemegu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4133d062---73339479073.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/pepekulemadikiv.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/f11410ebb7b0f597726126f1bd2b09d6/8212087915.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/97927514393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=jacobinte+swargarajyam+full+moviePDF 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_off0001049c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 11308 bytes
SHA-256: 8651155eecb83971e9e555e4c3c7354856283c5fe3b374f2f5b418e93465ecbc
font_01_sfnt_off00011f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13759 17340 bytes
SHA-256: ca21c2c651a54566f7a2d931422255d11ab219c52f764da31b30c7835bce2455

Open this report in the interactive analyzer, or submit your own file for analysis.