Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4ce50c934a1504…

MALICIOUS

PDF

83.8 KB Created: 2021-07-05 12:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fbedf75db7000c6f59c81da01ddaba27 SHA-1: 8b96ae8c7b5c90cfa710829af584c69ebbc9f944 SHA-256: fa4ce50c934a1504abef4bc87566bac15d9d302e2ca0df87fd041962f05d32b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, potentially leveraging spearphishing attachments as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/316921c45c05a7d78b89fd61e57126fc/xamazefeposediwotolival.pdf In PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9f3c0e5915320f189679ab97e13726d5/selomifudi.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/73988824894.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608189ed709dc---gakavunojufowe.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/96879394366.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/woriso.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3b85ed041fbab49cdec7d2d3531c3e01/mejeme.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/rilodujefaj.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4feb90dee2---38565484246.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/78f295e6345f72d61eac677df80853bd/rasegofitogotuxok.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/63bf55e09e0429d6b766f4eb545dfc77/3002829131.pdfIn PDF document text
    • https://susta.vn/userfiles/file/27018199378.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/68052206125.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/vuravekofosimudagapo.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1621723255765774730.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7ac97f9be35937fff0c533ed6062d84c/wonuvas.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4903fe0678fd542084954ca9973a5a4d/38546674246.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a553262e0bc---57910120900.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/55064806217.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/7273f40ecbff90212b5cc964c72f234d/niman.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088cde399d52---83622906948.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608772dd18fcf---11205811401.pdfIn PDF document text
    • https://4appsoftware.it/file/61210511935.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c09ef4a89e033c6437da52c5c19409c4/76503301927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=labelled+diagram+of+compound+microscopePDF 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_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 16848 bytes
SHA-256: 79c022cc87cde9bc5e88781bd6e57b3d750aedfb70a07ed179ac19013d89c0bf
font_01_sfnt_off0001108a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A1 11060 bytes
SHA-256: f759fa2c67c7c4d658b9a428cfceef956531b9f8d152d0cc3e4bd87f8adc3b94

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