Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f962706fdcb0d2…

MALICIOUS

PDF

72.6 KB Created: 2021-09-16 13:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6abf4ceea69eab902b1b796a8bf5641b SHA-1: e6d3431611c85a424ca1ea950becc8222d391b73 SHA-256: d9f962706fdcb0d241b1ab468f1af6b993002154e6361974433db4bff7e7cdc2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://timandlor.com/userfiles/file/77992210338.pdf In PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/lefesipusuwu.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/73373645036.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/51608126516.pdfIn PDF document text
    • https://steammining.com/userfiles/file/94411177714.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/42db6f51680417389a37ddf7be50d5a5/zewokoseboret.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a39e621a2---30336660951.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/48354330416.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///81841747571.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/noziwijofudobixajawe.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/zatigoditerenukipoza.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134819bce96d---10202427763.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/52496919290.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/faf5d119e91514f97003dab705013f73/83833932064.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/38954374700.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5513544730.pdfIn PDF document text
    • https://telorgabus.com/contents/files/11207770068.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/vakovezubawujugus.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130927cabcf2---wuwejufun.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613991e233531---gadudapafiz.pdfIn PDF document text
    • http://erdbau-rauch.at/49456627435.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/98280816978.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/40542967859.pdfIn PDF document text
    • https://pindimana.in/uploads/file/9581322683.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1630951211126779284.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/18966799180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=which+android+is+better+than+iphonePDF 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_off0000ba9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9A 16424 bytes
SHA-256: f94920a7621f31657335e04b2c57e8cd5bdfd87616a5141e21c1f73e01503845
font_01_sfnt_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 10700 bytes
SHA-256: dcb89a1e32c199987d4d71a4edf563fc34ee142aa3fc2674b7dcb13c255f83f4

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