Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb1f3e58582ddee…

MALICIOUS

PDF

87.3 KB Created: 2021-08-15 20:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c4057fed88ba6b4b5c449faf9f33d0c SHA-1: 56d1743e3cfeb82d905f1e5e232dc0c6614f3534 SHA-256: 5eb1f3e58582ddee6837b6ebe3ed6ff361dcc5ba0259a71dda783fb2d2d9f163
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and potentially disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are indicative of a spearphishing attachment, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbdb486d6b---vataniz.pdf In PDF document text
    • https://reparationmobile.net/userfiles/file/12381392070.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/72394972492.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/goduba.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e493b5e0ad---laragusatu.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/pibuwilivawisinadi.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/rowozez.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/22e33c7659f7f9c6a4dddb058597f065/87987424992.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2823d00a---ruguralunekiwaxobuw.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abf35b3ad3---29688248603.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/pusabux.pdfIn PDF document text
    • https://manenshop.com/upload/files/moxifevajogamovawi.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c64c3a2d767---33161193403.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/13135879320.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/78960150243.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/numazonogavijogekejupovel.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a27d646aa47---47845661976.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/70149701750.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/sowutila.pdfIn PDF document text
    • http://bronia.org/userfiles/file/sanapekebimar.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/ddc22319ceb8d85338b6f4a2fc0e54e6/45332002187.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161187673518ef---72230672028.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/86365605055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wudase+mariam+tselot+pdfPDF 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_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 16596 bytes
SHA-256: 876a9aeb423d3f6345f884083d7b76a633de958a491d01eabe54c06330416c66
font_02_sfnt_off00011f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F57 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off000134ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CE 10648 bytes
SHA-256: 88c869f8ac2a1c56351e66c3ef2eb1aeece1ba0d229ce5b527ee117a59a33519

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