Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8fef3cc26f627e…

MALICIOUS

PDF

85.1 KB Created: 2021-08-19 03:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66ee437dba929b5ea32533c59cb2c25b SHA-1: 4a60fe41a1bfd1ce675cbc44a408efad48bb0016 SHA-256: 4a8fef3cc26f627e3ba6ddbb3a7650efc6eaa50262390e6acb9b90f9a40e48c6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://top-conversion.ru/ckfinder/userfiles/files/lujejetisutepepexodojili.pdf In PDF document text
    • https://steammining.com/userfiles/file/potofu.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/37305727664.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac468a010---kigoxibope.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/takuzadifak.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/vajibikinodorotelazirekur.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/34418517957.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/banonofumaro.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/komekusonaxilab.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/xekisipuratabas.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160962db152233---jegadukivut.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/k7i47f4lr65k9cmos54pmu6fo0/84940223541.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/85279530643.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/xuzosopurawirodo.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/358958045.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d357ad9e9b5---gogerapazajetenolopumo.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611da31d4c801---66916933468.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/28663278072.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17a949ffa---kodekokutepewunox.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/46574404788.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd0b16e195---4731495108.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/60420329966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=net+framework+4.6+2+for+windows+8+32+bit+free+downloadPDF 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_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 16832 bytes
SHA-256: c43897afe9bca737c4787fe7af88671d6ca35e6342e2dda00d0509046b1e15af
font_01_sfnt_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CA 11624 bytes
SHA-256: 9f752590fc2d504630ef4bf7db4f0d62c691ad55db7c39c09ff8e58d4cc128e2

Open this report in the interactive analyzer, or submit your own file for analysis.