Malicious PDF — malware analysis report

Static analysis result for SHA-256 35425259dee90790…

MALICIOUS

PDF

72.4 KB Created: 2021-09-15 13:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24edb75e6fd8646b2e01455c2951fa52 SHA-1: 0877c897daae64d39225c5a7fb2295ad798361b7 SHA-256: 35425259dee90790ae288f0062f87c4801a54c5b3e990a6f5cf24a7501c6d7e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to domains associated with link farms and potentially compromised content management systems. The presence of these links suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=how+long+can+i+keep+raw+chicken+in+fridge PDF link annotation
    • https://domilot.com/uploader/files/dagajape.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a66810a5cb---wejubade.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/rakuxonij.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/15360281121.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bivixotajuzoluzag.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/lamipixuvumevijopotijon.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/51426816177.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/navubudivozidak.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/54086543458.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/17551346280.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/62796171963.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/tugapo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/58968eae35d7f238c69a48320cb4d696/28742988652.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/gixikepekoxigarij.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/tedotowuvumuven.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/df2893ad3d29e3cb55c864aa870d8bd7/vujajixerafivujewibut.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/sizefinedowokeratikevaxod.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/dujasubadajaxonetekef.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/52812205734.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/54924562633.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613abd73a7d8f---fozasapomexefel.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/46191584361.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/juzapipuzivakukafikob.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_off0000bae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE4 10804 bytes
SHA-256: 8f807adb87f7d4e5a2ea61064c87520b29d9d027f912979c17576b40ac134665
font_01_sfnt_off0000d383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 15824 bytes
SHA-256: f3e2346738399c7fc0f70ff208cef79fb3147fefe39bc85aeabd3677a55e6143