Malicious PDF — malware analysis report

Static analysis result for SHA-256 713ac407bf36d90a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 15:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aaebcce31b13bf0dd6866962206e3961 SHA-1: 92a1d0fa6147eb326d3c449eb3947a98ab959fab SHA-256: 713ac407bf36d90abe87eabe841d63f26949223692b72d0fddedfb3f3fb294bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. One URL, 'https://synerhu.ru/uplcv?utm_term=candy+crush+saga+mod+apk+unlimited+gold', indicates a potential attempt to trick users into downloading malicious software disguised as a game mod. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=candy+crush+saga+mod+apk+unlimited+gold PDF link annotation
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336c8341242---27801142566.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139175006476---wisekozewaruje.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/18283105712.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/venibamakasodakow.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/36589028666.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/sumagafaverosegefibelil.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/33c1cd5aa9ae4caec8f8a5e3f55a1b8d/susulasig.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/teluba.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/gefalimigiwiwiv.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/povovutalunosam.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/2175948687.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/rinakibujiduroziboliruvaz.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/70969578771.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tanakolanuzibi.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/77417533780.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/54626d1a2220a68c7f3feb6eb208d43e/besufudinoboburegiz.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130072a48ccb---jobovukarevafekixi.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/bowofibakemewirogowebe.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/tomedumigipokodogarodol.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/85555502799.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210906212422.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133d77e447e1---21856123122.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/mosawolusinomesujoz.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/42813901903.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/vpfifg9927k0lkjjcrfbtis3c3/83311826042.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_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 17384 bytes
SHA-256: 2e83d75305195c5dd508e5b25546cb55f1d1ecda9e06c3d088da8ed6b8f1d2fe
font_01_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 11296 bytes
SHA-256: a513b39cf1f4fea9508f08b144fafbe77d45dd4e3c1dc8c65ca48aface49cf15
font_02_sfnt_off00012292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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