Malicious PDF — malware analysis report

Static analysis result for SHA-256 625e806733c59eef…

MALICIOUS

PDF

89.2 KB Created: 2021-07-14 08:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 353d224dc44b5aaec3627a698923f45c SHA-1: 0fb59682fc154326b9ffa52398f42bbbcd6b9f2f SHA-256: 625e806733c59eef6a00d6e1b77fa04ec36ce9136c5608aef0603d8dc7e8000e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF itself contains obfuscated content, but the primary malicious activity is the redirection to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/2ba444f41f447b002c89e8dbbff30c4a/93560318899.pdf In PDF document text
    • https://egyiksem.hu/uploads/file/88429507651.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb1e638f5---39216248020.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/cbb39524e6681fc0b3f4c87cbee93153/67381325908.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097004327f1a---81653501737.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/bbde01c089757bd89d0cebeb41ba4ab2/xaponenuzizupinigete.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/565f8a60b6a2dfb4d2c709337f75afe9/65723742067.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/24184759087.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/lezisajunuvasamuwaduka.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/terokunisunidepe.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/kazaso.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f24c9bc41948c5b40d900df174834d8d/24446585400.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/64015473449.pdfIn PDF document text
    • https://congnghethucpham24h.com/upload/files/xapokejixazaledi.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/belavipabilarimejogarofek.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/lakuniwodol.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/19595146234.pdfIn PDF document text
    • https://nistd.in/userfiles/file/xajezivexitow.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/sefuxofuwifevozofotonu.pdfIn PDF document text
    • http://expresskaliski.info/file/29647098280.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/92549925059.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4a05b8a9f---zuvozulikosubewinamutina.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e46eeb9aea6651f68748e5b662e2828d/59303619030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=national+security+and+double+government+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_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 11360 bytes
SHA-256: 6ed482143da553350b8c0852fb71d97e9812958d9ae31bbddfe61fe6bd9fe59f
font_01_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 17488 bytes
SHA-256: 4f5e21d875cb00a417b086a07290b25c9b3fb006607afa245a25cfbb662c57cf
font_02_sfnt_off00013d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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