Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df11e5c8b971363…

MALICIOUS

PDF

88.1 KB Created: 2021-09-07 21:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8506630a1713f149de640931ecfbffda SHA-1: fa96770e4d93576c0be47aa581fe0e20a16c67b4 SHA-256: 5df11e5c8b97136327728244decc311a79dd437b9148f2d254603737523927bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The presence of external URIs and link farms indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=standard+deviation+excel+formula+manual PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/651fe71d02c4d26903699425409069ca/lowepuz.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/g6gl3te6dad7aiksi3vas7724h/pazupasodetonebowivamo.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/zugaraletobaxulaxos.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609884056af1f---wamexawoxamu.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/zazuki.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4b90afeb1---tomesokubederul.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/nazifuxetidadaruloko.pdfIn PDF document text
    • http://cycling-software.com/files/file/499693239.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dfbf28c9a---kobez.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d90b6f8097e---lebazominogiv.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/o4d5i60brcvg8pt9mr80q0p14i/47916046719.pdfIn PDF document text
    • https://faprosid.com/file/75676202043.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2009f15b1---96267812597.pdfIn PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/vategu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610a8c9384945---bosubifetutusudele.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210522055819.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/56587708746.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/suzoneduzegulesepexexim.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c84c843eaf068bfadf92dd9b1f68a052/96529667543.pdfIn PDF document text
    • https://go2germany.ru/files/file/wisitibafuzime.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/81731013084.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/56823092977.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/cadd9a9cd68144258ebf57268fc4b73e/jivekiradutamanoxa.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94edd2929c---rosezakirumunoji.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081105c2bdc4---35474055177.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_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 10812 bytes
SHA-256: 375a4b9c3152d8ff9d6cf772c491979ce1e06034a8fc1ee1d83beb6e80da00f6
font_02_sfnt_off00012396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 17800 bytes
SHA-256: 75525f9a5612443cf99d567973cf26fae68327bc21fa7aa0ccb605dba6f72071