Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23e5d3b48d470d3…

MALICIOUS

PDF

76.6 KB Created: 2021-09-08 23:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f884ae862b1cdf6602e893bfcf1651b7 SHA-1: 449e3e998e14bb4877c0dfbe2cbc2ab2fdb2a8ba SHA-256: c23e5d3b48d470d3d5b7e92b6b14f542a494b893f96268611e5f5fcbc14d8584
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links pointing to websites hosted on potentially compromised or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://thietbianninh188.com/uploads/files/14804044294.pdf In PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/69276275684.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/44897943467.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/wuravet.pdfIn PDF document text
    • https://go2germany.ru/files/file/97683539086.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/50850624079.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613005cbc66b2---87198026178.pdfIn PDF document text
    • http://12shio5.com/contents/files/52653455203.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/gefazegaseluxu.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/6721816996.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345a2123131---tozojutomatamoj.pdfIn PDF document text
    • http://innotack.com/userfiles/files/67454525539.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/91409655946.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/381pubtv4pa367sp90peuldhc0/wemejalefujebirovad.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/saxufofirivarovabugupu.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/68904905678.pdfIn PDF document text
    • http://climtech.com/files/files/suvudarimoxup.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/35557510989.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/febakasezinovikek.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/libade.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/muzuzalujuvak.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/pegulezotefadapalor.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/jonaponuvilafedipotodev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=adult+manga+pdfPDF 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_off0000c901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 10308 bytes
SHA-256: 3fd20ab17cce7015dcac61eb6c72ba4cabbf61543bb34ab249aaa5f1db898418
font_01_sfnt_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 17496 bytes
SHA-256: ed6fa347a8090bc5cde8f19f7f3a3ab988df047b91563bf843140e6c73a189e6
font_02_sfnt_off00010ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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