Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab25b74b909036a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 20:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f79a8186a9863741399b64c993c0903 SHA-1: 1c654a493f5ff1ef0a975cc5f7d3eb3577aa302f SHA-256: aab25b74b909036ae01195933dea1701fc1aac0f9e4fef1aae07f889b0f1d2ea
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 phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://benedictinoselrosal.org/ckfinder/userfiles/files/taniwefikuwitavezeluja.pdf In PDF document text
    • https://vinasimex.com/uploads/file/29237027524.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/94884669837.pdfIn PDF document text
    • http://goldmustang.com/files/files/tabeguxumet.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/u1gkvqelrmuvoj990p0eif599r/19218343833.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348f89c261f---zanotabatategavose.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/virutepa.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327c16f1a8a---gunofurawibo.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/bimomofepemajogofumupito.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1b3066786de930be758e3dc7afa7088e/tezoxovuvub.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/tapuwinonoturuse.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/jerowegaderijifile.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/32565409181.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ba93cb1645f8c7372ce171217b6a7851/zalidaber.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210913060225.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd9233d6a8---berivafezanizuba.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/90673056527.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/18713588311.pdfIn PDF document text
    • https://cityface.cz/res/file/videxutarefemisefipuvo.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/jegovonigilerulap.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109140437453452.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/8810198996.pdfIn PDF document text
    • http://acril.ru/ufiles/files/67961039035.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/bakatom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=five+night+at+freddy+1+apkPDF 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_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 10744 bytes
SHA-256: a9c99aa4a42d9e2901adaa0efe4bd0c0d75de811d34adad23a7a245716c62be1
font_01_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 18196 bytes
SHA-256: e6eedc56c8fa2581176ffba3210be18aa34ca805fc8c568e9e635de5c90d4fb5
font_02_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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