Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b140d2e87469353…

MALICIOUS

PDF

119.7 KB Created: 2021-06-23 21:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 70a4e48ac3f9e2c4ad5a095171c24cea SHA-1: 9e0ddd10de437930613ba8015887374fefbd4ece SHA-256: 1b140d2e87469353a515eff5e89254108f9d5f8dea18488cbdf54c0245858b5b
216 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a seed-phrase/secret-recovery lure. 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 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 https://allytemp.ru/uplcv?utm_term=how+to+resize+page+size+in+pdf PDF link annotation
    • http://jtipartner.com/ckfinder/userfiles/files/boledilesevuxusisud.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/32964583932.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5478270bd2---23478015792.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/10668525381.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/698af4cde120930e94bb0eaef76cf5b6/92825998953.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c37c7fd4b6d---22486654213.pdfIn PDF document text
    • https://securitydm.com/slicice/file/88214425207.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jefatilaje.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/27931006874.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ed2f7b767---34695305564.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/16b148a4e51c8117fb447cedc663151f/57639785488.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e7dee7cd2---vifalatepaf.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b80bae360af---66463467217.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dea18dad0d---duwimepowufap.pdfIn PDF document text
    • http://klpa.net/userData/board/file/vomuxafufumuxi.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/96a4cf951637658a2aea0deb0db2f53d/bevolovoxejoli.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3fbe6a8b0---2043338030.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/mun42p75i2frq3co4h7p0t8s27/rupemupaxamugefo.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/738d5ab7482ac90190bfea965b51ae63/23985184548.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19829 5280 bytes
SHA-256: 4d0f37db1cd79d1666a350f25ada791cb732c496fd1af9ce5947073a0ebe2774
font_01_sfnt_off0001aa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA4A 11456 bytes
SHA-256: c60e22c9a3952a0e1f3ec6a926b0ff20972aa569815928a7d6aa567adc2ed993

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