Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0bc94bca10aab9…

MALICIOUS

PDF

121.1 KB Created: 2021-07-01 18:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 839882d24744d384d51992eafebe87eb SHA-1: b667c13b412c2872c493841cd9deb91d0bcf4f13 SHA-256: 2f0bc94bca10aab978ece62b66488ef2e4f34f62501cd1d07e001456bea5b469
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malware or conduct phishing. The presence of external URIs and link farms strongly suggests this document is intended to lure users to malicious sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/aa1eab35171129c1689de811f0dede4b/zatagaminitizonobo.pdf In PDF document text
    • http://zjhywt.com/images/upload/File/nidesenubivoguriro.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad889a5bc1a---27876304350.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5b0gd0hjv134vndm595k17sck9/6044288805.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/76688400473.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5debe19b27---66787202858.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ct7g7d3b6inm4eccepkbn0v78g/nadopinonagobiniletizo.pdfIn PDF document text
    • http://vinmexindia.com/uploads/xajigataji.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/77701157854.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/59811926637.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5a341e8ea220bcab56f91c17a309a5b3/81995064041.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/pixatixesupubeximagof.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/05fc98c31a456cc8c2cb03fcafc3f284/4350566134.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f093d51b---83855476385.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aab787f56---68418082617.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b737e88b931---pifejopakozina.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e87218b3a0---nutes.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/2fe6d60aeab69469678f721b40d9d26e/lesawokebosanewi.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/4828179500.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/usmn8kipeuqcaeftlakr8mcep0/5248619124.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fa5fa6591---winaroreruxegavis.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/nizaloligababif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=2010+f150+bed+weight+capacityPDF 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_off00017652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E64 18060 bytes
SHA-256: 83c25587e19ff1e47cda4ae93f3d26d2e5dac37f42aa405d40d062a1c1186b96
font_02_sfnt_off0001bdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDB8 11032 bytes
SHA-256: 82249ad7bae44a1379e8b3272981c068e36f12f2e537bdbf8c020cec04216bed

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