Malicious PDF — malware analysis report

Static analysis result for SHA-256 99880ca55b49abd9…

MALICIOUS

PDF

90.4 KB Created: 2021-07-26 00:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be2f238f765ac568b33fdc394e37b5e3 SHA-1: 9663c37ddd53acc7376df0a95d05236c01ed14a6 SHA-256: 99880ca55b49abd988e8b6efe66782d084acab28c2f2e776830c9cd8b5b7c329
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://botosani.ro/img/uploads/file/gagowurujijama.pdf In PDF document text
    • http://degrossier.nl/uploads/file/bejip.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/48386788808.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702fb8ce14f---rutumugefonivokutiz.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de88d760021---wimumoguxejuvijuf.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072011c82056---37831492982.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/2189356297.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/234040c29a3c7fc1e4dbae3a0ea7b4bd/3436917121.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/lusos.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/18354128818.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ca2c070260d9be7860dc4ad981c4d8b9/gojezonijematug.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/tixefugeji.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/28469164838.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e5abc943e---nosiposefav.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/zududakiwerasanar.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa613bbb79---munawumoxilusukimove.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607034317cf44---90789310584.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/67520475156.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/nazes.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/b4a5de90641ff497a682f3dcb7dd7340/mavobagux.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/jixunotolukowaxome.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/48478894506.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/mumiliduvadivonudemu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/meqjd1m77u3u9u8s6j2b0j5ecr/wejejimolobofesozasipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+apply+for+a+bahamas+visa+from+jamaicaPDF 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_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 11036 bytes
SHA-256: a568f5c5280fdde5ba080ff8da2ed2e64ebb653fef3898cde1b2fb6c00ac2b48
font_01_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 17040 bytes
SHA-256: 6ee4553a24db109d903e0e9f8ee8e03b3e3c64b715eeffdf778c22cff2051172
font_02_sfnt_off0001428c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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