Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbee0f684fade9a…

MALICIOUS

PDF

89.6 KB Created: 2021-07-30 10:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1bbac7e5342bae545be32b5260217aa1 SHA-1: 8458ee8eaa57abc30dfa44c49a7cc768c2a67567 SHA-256: 5bbee0f684fade9a5a4fbb9381857c2289ba55b5e638fd7ff199694ef28b52f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of many external links suggests a redirection mechanism to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=racing+go+karts+for+sale+near+me PDF link annotation
    • https://vildmarksjagt.dk/userfiles/file/2044946501.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094826e58a92---nuxofepe.pdfIn PDF document text
    • http://lawngo.net/fckfiles/sikibalusibexavize.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/gifoxopemijalowupid.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/500ab9c679ecf7a11f3f20fb4c701c65/59855083321.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/86505422447.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/wadobirovoku.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/58073890513.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaa27c8590---80853628921.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/6f7a3c2a7fc769f46f6debe16dc65d13/15127458308.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/zixomenanosuges.pdfIn PDF document text
    • http://cochu.net/resimler/files/51643157128.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/0d85c9c63158c45c4b8e75d9398e9647/riperuvanusadawosurovefo.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/90d7ec35b5b559f151950838e424c442/96646827564.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/bunamudeberiteditaguga.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5820727a2---finigege.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/65047661370.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74fd40cde4---tipuvipazubi.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/fknij5felipnenm1j02524fud1/luwoduzotoku.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/wijoforivisu.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/bogop.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733e93a7b38---13351490234.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aae66c2b78c---bojubexatisipigo.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/duzazulariduwanumik.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/jovimazofikusawax.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_off0000fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 10816 bytes
SHA-256: 7ca1f9cff7b271a44d87c9c99f87f0d7ee2bee7842ece4488182d1b6291aa560
font_01_sfnt_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 17216 bytes
SHA-256: a983a114179d185af7684fc01cab9c9f174b245f43eaedf7ca0b028ae1a77722
font_02_sfnt_off00013ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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