Malicious PDF — malware analysis report

Static analysis result for SHA-256 e926f267d0c42527…

MALICIOUS

PDF

102.0 KB Created: 2021-07-31 01:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d20ee299335d831f0c2ff7f3b36f65f8 SHA-1: e31ad897dc93fc72d659e2b8f961e1ecbf3a99be SHA-256: e926f267d0c42527b766c28f9cb000c04e67e575580ed2796d470a65b1b4e305
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The sample's structure as a link farm on potentially compromised infrastructure suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 https://performanshost.com/calisma2/files/uploads/tekinin.pdf In PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/3naghvmd02omspjva80edbj7tl3c1s1c/pavalelizewarodegibima.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a6be9058201---retuwesezamudolixu.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/880696322.pdfIn PDF document text
    • http://royalproductsonline.com/userfiles/file/rakupogikibadojopasajevi.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/42790952181.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/58094302757.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/91737955847.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f794c8e549666ec2a5f3b2b83cf100cc/kebefujozokidugiju.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2760ae1b41846ea3dd4f8f5f0a0e45b0/pobifomavobupetijijomejim.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160747927245c4---49735299427.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/mawogunamolawolufisaw.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/migizafavarikofo.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210622_185957.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608570b63851b---zujesusenoxezalaz.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766378cbb6e---pemawokidugupopadatupuse.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af66353a5d7---68989879412.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/wepufipe.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4c13cb1fff5f15e430a4caefe7d2d09b/91320380032.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/5834635442.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59dc939c41---43640709750.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160820768c7e1d---92877002607.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084475e7e369---linulobodepar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+learn+n5+kanji+easilyPDF 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_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 17016 bytes
SHA-256: 1ba1fa1e37b52aedfb5ce98c1a0d6528cb826943122709dd8da42069d6a43e6b
font_01_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 18744 bytes
SHA-256: 1cbe1855776494afb1cc137c5676b6149f1fb8631ba5827707e10f078c3a2a84
font_02_sfnt_off000159da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159DA 10648 bytes
SHA-256: 760efc561674e415ed987426f936d32ba6de8aa5635b1fd4beacf49672620f15
font_03_sfnt_off00017267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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