Malicious PDF — malware analysis report

Static analysis result for SHA-256 918454013f259a7f…

MALICIOUS

PDF

88.4 KB Created: 2021-08-09 03:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b425437f95b593380d7fd011dd8efebc SHA-1: 0b808f51e70efa401bab5247775beebbd401671d SHA-256: 918454013f259a7f7c0ad79f6db0cbcd37aa3fcb79a3a31f0d7f29ba644d0a1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains a link farm pointing to multiple compromised WordPress sites. These sites host other PDF files, suggesting a chain of redirection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the link farm heuristics point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=como+fazer+costelinha+de+porco+na+churrasqueira+a+gas PDF link annotation
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f66f33260c---13126076448.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/117bbff5040c57770b16007e2fae05a8/41204963695.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/817e85628d08d084c1e170baa9c90b22.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/tpel5apvgs00d567tlctejf3jf/93938567383.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/naniseniwuwi.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/21499765881.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0bf6cb586dbbcf8b07345509806bcd77/vujolulobejejiji.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/wolebowoxe.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/texukaloleturumetativara.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/46925813950.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/tegaporotisurumulomu.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/41763858868.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3ff3c233f83bff505ca5202140d4a1a4/dumaxoligajup.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bff80fa982c---72115758589.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/musufovituwabuxavuna.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/8296586668.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/71147917974.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786246cce14---38731097982.pdfIn PDF document text
    • http://cjatkinson.com/userimages/jadisoxiwilenuvetijame.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/90607678760.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e32427ece4e---68651390329.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/58705902200.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/tologu.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/jomedutiwudiwona.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/32d11fb1ee51d680b5757b85053ac395/93091149208.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_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 11404 bytes
SHA-256: 1c9bef0e806bfdbdab27a63cf2143f1814463e15d3678aaf1aeed798b90ade61
font_02_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 19592 bytes
SHA-256: 6bb66f9552c20fd41d2dce6e8c533abf145a63747eb3f7cd522f74d666653bb4

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