Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d641706394318b…

MALICIOUS

PDF

95.4 KB Created: 2021-06-17 16:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0942f1526b1f83d3b42b7cffe2e841e2 SHA-1: 44d0c443186c8e39d4fbc6bab3854792e1e9a315 SHA-256: 42d641706394318b81f8e3199bbaea2301f57eb96ccc3ef7215725a54156b62c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6928

Heuristics 5

  • 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
  • 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://crewmak.ru/uplcv?utm_term=class+6+navodaya+vidyalaya+entrance+exam PDF link annotation
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074d03753b49---27336975041.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/24lisa56fu9cr773s33cc3df16/sesonumafoxexeveravi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be48bee6e8d---durufosizalegezukuzilat.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/bb2d1d48c96fb16782b42e07f2f5e9ce/39089524620.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/d3cbbe408ced492433e8d2cb07f33a45/nefepedokusosafut.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b30187995d11e129a0b57f497e552674/tiwujopefipulu.pdfIn PDF document text
    • https://medtek.vn/storage/file/vujubogogixitaxefupuxoz.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/84240605720.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/6h412g9pin4a050keka9so8787/78581380255.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/a54186fd054bed91f9fb600c0a7ea129/jamavozibirivamakuro.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e6f897fd2---sefalivonevulige.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/4b42dac04f4647fa82435afb9f3f7f77/zeliramagenejoxunodi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/78230225417.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4uk3sgacqdnime652pob8jr7ot/38560426672.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/733b0110c26703d8d787292240661627/rejofojikilularuxenali.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C64 5376 bytes
SHA-256: 5ddc3ba0ec76787ee5be114eb376afc64f9d8f0da368c29f1c28fb1aad26a70d
font_01_sfnt_off00016e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E9D 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b

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