Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6727e492c3ab0f4…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 03:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25aad7c40fe892b63dce85f2ed23ee72 SHA-1: 59e23a7406d2637f527f7eb1391cd8c26c330de9 SHA-256: f6727e492c3ab0f49d64e72ab99b9945c3a5ebf63be79693e5152cc305a27bb8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://inwebjor.ru/uplcv?utm_term=blocco+numeri+privati+android PDF link annotation
    • http://ateliergermain.net/sites/default/files/file/26163023533.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/nepexarotemepugobot.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/37614448969.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/72321904383.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371b535e8f0---50801738388.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/lexikunupisavakam.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/dabinonaweg.pdfIn PDF document text
    • http://haai.org/upload/file/sixowodararino.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/33723951287.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/kosibutafiwume.pdfIn PDF document text
    • http://schturman.ru/files/files/7281335823.pdfIn PDF document text
    • http://techbis.pl/files/file/foleliguvakalujodipusu.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/3790846272.pdfIn PDF document text
    • http://turatabor.hu/media/77106083134.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/56544425721.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574beec269---57797779241.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/43125896435.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/1366e4dd3b5700652b1185b331bbd8f9/vosezezamugavubafolala.pdfIn PDF document text
    • http://koala-al.com/d/files/tovux.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/39673193796.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/87314338074.pdfIn PDF document text
    • https://rinducm1.com/contents/files/jaluv.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/tufexukog.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/22271667940.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/77839658034.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_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 10724 bytes
SHA-256: 3bf632c8d12d38abc54af9274b54199bbc7690fdf17b06a570c6ead418c031df
font_01_sfnt_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 18336 bytes
SHA-256: 3e88424c08cf85d1ddfb3f41658f231b3421acf6f128f3599482176ce8417690