Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a15c4d39eebae3…

MALICIOUS

PDF

71.9 KB Created: 2021-09-08 18:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a315433af38c16746df28b20af0cdc8 SHA-1: 69ac177e1e73070271995224451efbaf6ebfdc60 SHA-256: f7a15c4d39eebae3eae579b2ccd68cfca3e0325cf6ddf83bea9ba834b2218dd0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131018b709f8---76503932317.pdf In PDF document text
    • http://galenbio.com/images/upload/file/rijuzimajusupisiz.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/53113566193.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/8777981440.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/jukudofekazilabovodijudi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613141a15246f---xusolubunitoged.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/pivowaw.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/titef.pdfIn PDF document text
    • https://arerp.kr/data/file///fatoxojife.pdfIn PDF document text
    • http://meta-min.com/files/lakavuwuzezizelabuvamelo.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f3802059f42e847f617700863b65f5e4/vipopedumofekupakasus.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/pilesufari.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/bamexuxagaboxidibawewejaz.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/gikipipev.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/8554980805.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/jiwibezofukufuv.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/14200312441.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/pulalabobu.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109031828164666.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/bavabuwemi.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/gopowovugus.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/lazanugeriv.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/33863751819.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/kalisavupunaxojejopitedid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=arabic+letter+forms+worksheetPDF 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_off0000b493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB493 10796 bytes
SHA-256: c67788be72a0dd398728ff2234c6379c3c1b58c1d12213338891ec9c73fabc91
font_01_sfnt_off0000cd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD96 17128 bytes
SHA-256: 70e174e9b1448a94eb9f243d173cee2bd7bdf148cacfb98a88d24adf463333db
font_02_sfnt_off0000f9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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