Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03ada8ca4e7e46f…

MALICIOUS

PDF

125.6 KB Created: 2021-08-11 23:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e7ce9f380e8c3a29e62329c5151a78f1 SHA-1: 1ef96f9feb632d2e1e224aae3806b6f4177066f4 SHA-256: c03ada8ca4e7e46f9f0d226d8c900cef556af00c6867d2fb08f766a7562e3fbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links to compromised websites, specifically WordPress upload directories, suggesting a phishing or malware distribution attempt. The presence of a link farm on disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14b45bc6a---boduxujovakox.pdf In PDF document text
    • http://myarrahnu.com/mo_images/files/bozofajoparaz.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af7d7e01fa9---59587230619.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/fojopub.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/sigikomagugajomenax.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/wutikokadudej.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609def0434f1d---14067002698.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20217321470.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/duvonopekujif.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/jeratoziko.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/vokukabotufojafewav.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1lsq3pcg05tk7kfc83t2lod9pf/32138501954.pdfIn PDF document text
    • http://slsnn.ru/content/files/96588045597.pdfIn PDF document text
    • http://huntland.hu/upload/file/zibipadufal.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/geriverufidovusa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7386d6a7---40528276414.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2d831b55d---26129535128.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fddb06702---zewinipivoto.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ujub96sqk9ikdtksfth73tj6tk/piteserisofiga.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/32192ea36b79e4040a2214947f6ec6fc/repira.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/r2rt17ne6srbtqcsi8dap2t5r3/rojuletuzelegunojozer.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/dawej.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610c649d80434---xanexivinabijatu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccc8d2c6a8---lefalofedinitoxemivufi.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/9747383519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+systems+can+retroarch+emulatePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000173d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BDF 2152 bytes
SHA-256: a96194309a5f9311696a48839c4309401e8306f678303edddea6ce85983da182
font_02_sfnt_off00019586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19586 10612 bytes
SHA-256: 824a99ec97cf720544be586c909b2c53dc2199a244ac38912f80e24144cdda7c
font_03_sfnt_off0001adaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADAA 22424 bytes
SHA-256: 4b3ad1253f94ad78167bf424d6a119c03e6392641fb073bfd2e7dff457bb687c