Malicious PDF — malware analysis report

Static analysis result for SHA-256 982303a5137708bb…

MALICIOUS

PDF

75.1 KB Created: 2021-09-24 14:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a4ed4c65c9abba9fd14cf6457c25a18 SHA-1: 08bdeccc6c46bd42ceed7bb0b36862b5878e9c69 SHA-256: 982303a5137708bbde0018fa495d266cce29c563b3af3d7a3d131c8bbb949018
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://huntic.ru/uplcv?utm_term=apk+mod+alien+creeps
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139482811328---jatoxur.pdf
    • https://fpcofmacon.com/nbloom/fckuploads/file/95333081040.pdf
    • http://abhinavabhishad.org/userfiles/file/xetezidesebiwaruxox.pdf
    • http://podolsk-kondicionery.ru/upload_picture/file/wizifakajaloviloteduvofi.pdf
    • https://avela.md/userfiles/file/65387450500.pdf
    • https://www.mds-horizons.com/upload/files/kuxobegabuwu.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/79630580857.pdf
    • https://kapefashion.com/files/files/41188935018.pdf
    • http://smolninskayahotel.com/userfiles/file/waxozedepigobomoruribirus.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f721d86aea37041dcc683c26ab5d7bc6/74404056557.pdf
    • http://luisacortesearchitetto.it/userfiles/files/23508743447.pdf
    • https://basisnomor.com/contents/files/kiwigegizawozozata.pdf
    • https://csn-alliance.com/data/files/45989038206.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149d358d9415---difetanonefaxesotefogimex.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/kozodegexiburitaramagoba.pdf
    • http://opt-russtd.ru/data_center/upload_pictures/file/dagidava.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/29173818700.pdf
    • http://lignumweb.com/site/webroot/uploads/files/71260945942.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/48559949493.pdf
    • http://lavalnerina.com/userfiles/file/51093427680.pdf
    • http://dsfly.com/uploads/files/pefaxifadakegexumofelenek.pdf
    • https://scalping.ir/data/files/file/86283229791.pdf
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/topifinokokevikogat.pdf
    • http://devison-matras.com/upload/file/70112472263.pdf
    • https://mosallaesf.ir/uploads/ck/files/vixizejetepe.pdf
    • http://aliguoriarchitetto.eu/userfiles/files/49379438577.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_off0000bebb.bin
841f8d05fd2a5a53f30f2be6931ed7b657d10d9093824fe8b9d06f4a6cb6f6cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBB 18276 bytes
font_01_sfnt_off0000ee68.bin
7dec25937da22f7faea0d5672b5898067ba50c34a1fbd0a6757730d43377077d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 10652 bytes
font_02_sfnt_off000106bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 16792 bytes