Malicious PDF — malware analysis report

Static analysis result for SHA-256 884b0aae635e5e61…

MALICIOUS

PDF

76.6 KB Created: 2021-07-13 06:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 00e13edc10f6a720e4f20cda9e02221d SHA-1: b7d04f38bbfaff7825cf339ba01500e27b7d6522 SHA-256: 884b0aae635e5e615b3efaa248884e497c9f28bb558c3163e1a03d75970c9e5a
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://carolinaboatclub.com/userfiles/file/xejilemufasinegajoli.pdf In PDF document text
    • http://ajivikafinance.com/userfiles/file/37720610645.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/89ishfs1to2g1i9hm8uf4293b1/76932796523.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f52e8a75a---55100355544.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c698cd4b44---wafalefulamodemubotebuve.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/japs3ilkasgl4ob4bjrh738clv/farunenuxalufu.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/fmjjjfjp2khev09kvnfpubrpnk/25516182810.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/36907247849.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/m5clkh3uhka1jlgjubkmmieva4/63758911347.pdfIn PDF document text
    • https://kueapem.com/contents//files/23231235475.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/popogojawivasolimexowuro.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/4a6b87b342dc7cbabf0d710c7ef94f95/sajilujelotep.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/92773104461.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210520/file/18053739054.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/722e4006365ba5e3fe8db43165f7e6fa/8668612884.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/m3ff43qgfcsdf1jcm3058svk7h/fufonavolunekeratixog.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3f1e07031afc0425da95f9a3deaab1d6/81728510772.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/19718137154.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdde94532e8---vuxegoninibojitegixesutak.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021060318372063.pdfIn PDF document text
    • https://ecoretras.com/file/muxibamuraku.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba282b25fbf---nutasilasulabokomawusali.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/ed3ffa2fbcf022e4a6794330d2b1a864/dapuzosuwuvilutusobepa.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f5758f5be---dovixemab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+find+the+least+common+multiple+of+2+numbersPDF 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_off0000cae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE7 11324 bytes
SHA-256: 6bd00dec426121e1ede3adeceb4e0d16ca6adca87e08c813a4f130db95723623
font_01_sfnt_off0000e521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 15532 bytes
SHA-256: 4b7e1b8271a38109982092d86fff41c85a2db9662c4ef21cb5d05cba56d058ac
font_02_sfnt_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1