Malicious PDF — malware analysis report

Static analysis result for SHA-256 850e30a058b4cf61…

MALICIOUS

PDF

85.8 KB Created: 2021-08-15 22:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2584555c512bfdfb42eb7c12c912ab0e SHA-1: 3322bad1c7577cad4206355fa9bfd7ef38ef4a56 SHA-256: 850e30a058b4cf618e1dda82b031057352d3890b19b548ef99f3c567564abd4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=hanuman+ji+ki+katha+sunate+hai+mp3+song+download PDF link annotation
    • http://vyveva.eu/UserFiles/File/jifipejoresisidefurelaj.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/pasopojuzasiwivapojaruvu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790b8634d6d---fesapimejiguriwadufagutab.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/6901056498.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083e6e9432db---92867974744.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/12070424946.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9594062fb51b628aa79e730bcc3bb66e/52508733450.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/dusepejeguwokawazo.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b320acd3953---53632557343.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/eu2f7qtv6vmflo2brsei78mmq5/83747752245.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/rabutidojekazunaxe.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acd227fffe---80569302533.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b74695ebd---108739575.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/95173703635.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610353ecc19a7---77598361159.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c78970fb8---62302024293.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/84968804494.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/42427354057.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/kedosotinexifop.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeef9ec786---14790413349.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/93944130697.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/virufivefazurinuzipe.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/68bb26fc86e7fa544ecad3c5c658aa17/kigupobobaroburofuvu.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/tokuravo.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/tigugazegewovuselurub.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/setufegovatarod.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_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 11308 bytes
SHA-256: 12c0feaae5273b3acdbc4316dddc48693ddbc55893cc5b9a4a81c03da5aaa679
font_01_sfnt_off00010023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 17780 bytes
SHA-256: 2c92aa636d6d2c94918c6a795c1223bdd898665c1324f00fb499236098989e54
font_02_sfnt_off00012f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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