Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1db01d94ef0091…

MALICIOUS

PDF

98.9 KB Created: 2021-06-29 20:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: baf8efd8db5e0f6bf4ad5be6e320dd73 SHA-1: 87992d7abe466be6a73d484a571395efe89331a3 SHA-256: 1a1db01d94ef0091f5e4cccd24ede40eb905a6d685a8260a35d1f5500fbef9e3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the formcraft plugin for file uploads. This suggests the PDF is designed as a link farm to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c066bd1ac26---88879254497.pdf In PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609db965e4bec---xowatedazoraveziroludumug.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/ca58612c0b78e09f4fe9bfd0c8ea583c/simugusomifem.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607146d0c0e90---toxozemesuxigemomobim.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/larow.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092531ce19f2---46528978899.pdfIn PDF document text
    • http://www.heksan.com.pl/file/60011620699.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/tkv4s67tkhq1emhus0os7bi9o7/37391791431.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b4d9db150---52229724522.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/vitemubimelow.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/39892432151.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160916ded5392c---wirojaziwamimaxusomovuvef.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aab72ccd1ab---19894659793.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/25038365421.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/a4tsmraebtd9sv3uirons1u0bq/46073325748.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/683111433eb753f1af7231c4cfdbf19e/magivebupozijonino.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/7561b957a5f191aed4c400031defe3db/vuvekasalixako.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2cd750152---xokejesag.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e349267086ae1c99816ccba0108612c2/15379404008.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/42493428227.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab72c81a8---digagedizovin.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/xogegumitamakulefel.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/kifoduluteterupufexitam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=early+symptoms+of+menopausePDF 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_off00012198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12198 10624 bytes
SHA-256: a92d43582490bdb518c6a05439340f085161fce54282ccf05235891940294450
font_01_sfnt_off000139fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001520c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1520C 17164 bytes
SHA-256: fc896da0a47765979d7711d94bf6920b8ae5ae14431f7bf7100856189f443a3d

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