Malicious PDF — malware analysis report

Static analysis result for SHA-256 649dd0256e796411…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 18:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b1711bbc0e8bc16d2324bde7fc7a64c SHA-1: 9923ec652181999ebb604ba456d58786d6c85b51 SHA-256: 649dd0256e796411ffc330240caed0e50945fae2adb405cafda9cdffb8f2387e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bydnjl.com/userfiles/files/jojubogusivebuf.pdf In PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/32407006886.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/jidimetajejavakakalix.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/bobuwixugufudezo.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/lolizejozomarijelofus.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/35603748654.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/99791725200.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/15147360524.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/jizupezofenuwovefive.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/22187793111.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/vafugivifuxexukofifakef.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/vemiwemude.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3ad34510---nibajukifumodegifofek.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/kesujid.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/lewogikiwivetegumada.pdfIn PDF document text
    • http://trivio.it/userfiles/files/52801262849.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/62998e5e2234755e90ce2ba46ed81f59/zidedutipuwewavafefitam.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/wozaritifewaxojulizu.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/wuvibow.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/97082036840.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/37015366358.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/7d3a7be60ce77cdcd1448476a6be1401/78961205214.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/levugigis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chrome+send+page+to+phonePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/daxewinunarojopeko.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_off0000d8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 10732 bytes
SHA-256: 279fbd8f21d87301290994dd66c7a0882f79e3cf08c6e10be2eb872a11153b7a
font_01_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 17868 bytes
SHA-256: dca2f43b0d40c889c89f86b0ec3da4ec8631c2554c71c5d2a14054690d9e2ca3