Malicious PDF — malware analysis report

Static analysis result for SHA-256 a613f2056cd4890e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-22 15:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 29a725843991c50a3ed4f319c9cf384b SHA-1: a2a903d60565ea4d5abd45eea6a5ea763638c34e SHA-256: a613f2056cd4890e1bd59234ff4903de87a95afc6140643f9c437fa11453decb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple URLs, including those with 'download' in the UTM parameters, points towards an attempt to lure users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=download+jioswitch+apk PDF link annotation
    • http://munnarinfo.in/userfiles/file/89101909359.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/ranamezamifofuxitujuxon.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/95964898120.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/26897360755.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/davefuzukebupijatukati.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/ketomijive.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/23929156722.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/dogito.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a766e4b1---33740364988.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/84651966329.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/693mun4qvvo967m34n33lqbht3/napatumorodaxapibab.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/repinasatajisifupawovud.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/miguzelaf.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/98602545508.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/nujifan.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/tisurijiriziximapiwebu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/nbc5s7pn5q1bieeka3ik013ptk/44385681495.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/pajuvore.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/nigexovub.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/wesevugexarosufanizowal.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1df729d28---54464293190.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/luxofotupasevejotixebagog.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_off0000d345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD345 10688 bytes
SHA-256: 99987d0defbf4310992553e8838da505d1273fe2cd0451dff7ac2b3d3a1b6346
font_01_sfnt_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 17952 bytes
SHA-256: adf41a46670ee70629033cd968fd8d2b98521e4a3bf36c480c3a181b032a59e5
font_02_sfnt_off000119fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1