Malicious PDF — malware analysis report

Static analysis result for SHA-256 5127e981b851bfbe…

MALICIOUS

PDF

71.0 KB Created: 2021-09-12 11:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abf5e6f3024b7f24044df17bd2d88e57 SHA-1: 031ebc266dcb1e632cee4c53b9bdfc3b5ac62f65 SHA-256: 5127e981b851bfbe29091775a83ce5031619b9457d9c4e7a993bbb237ced0d60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=synchroniser+agenda+google+sur+android
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/bovixu.pdf
    • http://docando.es/js/ckfinder/userfiles/files/95085028366.pdf
    • http://ex2010.com/uploadfile/file/2021090422423973499.pdf
    • https://badanie-wody.pl/galeria/file/65025113335.pdf
    • https://kapokcmassage.com/uploads/files/202109071744265809.pdf
    • http://asja.ua/userfiles/file/vikeborijamejevovurobep.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/58697455692.pdf
    • https://takarasushimn.com/userfiles/files/zurikilebokumilid.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/o2hbkhs32pvl6tr682avmu2a77/zesogajoxokupamij.pdf
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/79929978881.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394459c783a---kawebazo.pdf
    • http://www.kickcommerce.com/userfiles/file/mumidikofadejozo.pdf
    • http://mothertheresapublicschool.com/userfiles/file/77245347876.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210912174334.pdf
    • http://starfishdowney.com/uploads/files/zuzajoxalajigejapo.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021090507193873499.pdf
    • http://www.farmaciapenil.es/userfiles/files/bizogirugopa.pdf
    • http://brilsports.ro/userfiles/file///kimoridisunafodur.pdf
    • http://ukwoodrecycling.com/userfiles/files/kevovewaxasujoxijiforep.pdf
    • http://dogable.de/userfiles/file/87061902544.pdf
    • http://hasyo.net/files/file/68048936978.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0da9c557---39504537988.pdf
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/54314120335.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/8265a6e2f6ef4d0749d4f142108f66a3/jazorip.pdf
    • http://gonzagafood.com/userfiles/files/67392761822.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b84d.bin
4f2aa4ec4eb1b35a205a116f9b4dcc42f36a63c5dbbe0e0ecd9c9ac5211b8c3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB84D 10840 bytes
font_01_sfnt_off0000d104.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 16792 bytes
font_02_sfnt_off0000e916.bin
f335df511c1111af6ece0383d2a2ca231002db9d0a2b720896f6b3ee3e7307df
pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 14756 bytes