Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2510f49ae2663c…

MALICIOUS

PDF

101.7 KB Created: 2021-06-29 02:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8174badaa0d059e1abd02d490b7be083 SHA-1: 7829af81c7d3cd27e44d545aedabeb22d9bafcd4 SHA-256: fc2510f49ae2663ca93e7739a1582648380480bd748e7b802b2a4ff071270914
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to host these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 https://smidgel.ru/uplcv?utm_term=how+to+do+sign+in+pdf PDF link annotation
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/khlpd864ftsf568o483emhr2qh/85546117640.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/6hjm7cd98koadsoori27slsfsg/10275888646.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/lodejujikufubunexi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/71574529582.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606d91aea762e---xogogewenoku.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/logolatekob.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j6mck6cnmcu6cdf3vd9iqietfo/667153773.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/a05eb6417bbde01975918c074b99ca89/befizogemusisekurasulev.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/r2n0g8m9a8l2t1re2hqj6buim6/33503902392.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/gutamoxime.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/n84ukm0l9tl1pcd2iblkib4hva/bovonigojobuzomufo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13d87ef921---pinuxegokajixon.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/94308431320.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ebb5c60e0---rokuwabesejow.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/93515900673.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/mipitidepejiturewa.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d38f02fbd---duzezuzug.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8bdee018---lozimiverosutumopusa.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf76cdfc4---80809307464.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/72848062038.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46d29bc604---84172693261.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16093a2d1e1222---pulonivuketamusuwe.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da393987952---5934930387.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_off00012a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A30 10308 bytes
SHA-256: 001ae794a8d2327d641f8e9283a31e1a675d1fe51bbc0f9616ee70db4f97a214
font_01_sfnt_off0001414b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001595d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1595D 18132 bytes
SHA-256: 0ea7735d0faa55aff3d3faf401ec573c878a318502c96915143db96faa47653e

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