Malicious PDF — malware analysis report

Static analysis result for SHA-256 b725a2293364d4b5…

MALICIOUS

PDF

72.0 KB Created: 2021-09-29 04:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c28ccdebb0f72fd12ae0e3952564b57f SHA-1: 24c18e8065994f39419c7d1ad952648957d6efd6 SHA-256: b725a2293364d4b5d881c7d303f00736dedc7cb96f55ad6c8dd844d15527745b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm with numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious sites or download further payloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://dataprint.ie/uploads/file/93932958489.pdf In PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///gifululuwaxifuxi.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/17877051866.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/jabamevu.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/21091207051218984584rtof.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/baloverepinuzejan.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/30224159797.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/tikomanokov.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/bb7b1e52a6c9a35497eff924d44b1ed4/78140648950.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/rojes.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/16694927250.pdfIn PDF document text
    • http://etkenkalip.com/files/gunifevupesosidimod.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/bodijedapemuxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150be25cc1cd---taloxizazubosaku.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/59771306083.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/tokaxusu.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/fuxisipiwosaj.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/28949458613.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/44782239390.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/muvikufejojakit.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483ef735284---42781742776.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/66982177362.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f22f05d2d1---bawidinisoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bollysharefull+com+bollywood+moviesPDF link annotation
    • 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_off0000b217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA29 17224 bytes
SHA-256: 959eedc60cb104bc0d47752ad52f915a46825be2e834f15777b4f85a1e433213
font_02_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 11100 bytes
SHA-256: 26145a8c69ca9fe52aa2ddcadf209a0feb5a9f7a1e51a83ec0067827802d0f3f

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