Malicious PDF — malware analysis report

Static analysis result for SHA-256 3873b348c95391ef…

MALICIOUS

PDF

89.7 KB Created: 2021-08-09 07:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 739aaccbc1f07802e4b5848866dc836b SHA-1: 0feb404bb8a729222a4930b4f76c93395e147fe7 SHA-256: 3873b348c95391ef1e52dbf5feb89e8b69df327c4c45a7eed1464b1e9f7bf3d8
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. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or phishing operation. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content. No scripts were extracted from this sample, but the overall structure and heuristic firings strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://nomylo.ru/uplcv?utm_term=libro+de+matematicas+de+tercer+grado+de+telesecundaria+volumen+2+para+maestro PDF link annotation
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/5dmi4adk4ehi9kvnbqr7cr31v0/masuvoriwav.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/25280565457.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a91bcdef6f6---31123213392.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e7cfc32b043e100197ce82b5df6d5abc/51452756528.pdfIn PDF document text
    • https://laser123.com/geektic/files/88418775125.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/pozotezu.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16098bbd48ea83---disoxalumamasuponolaw.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a40730375ada3485413a853d73990a36/77463014077.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/lufodetov.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/wesebezininuzulagujefuwev.pdfIn PDF document text
    • http://qzgj.cn/upload/file/novowerujomivesanilode.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/33406772157.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/58134513459.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/xaxaselarupikeziwe.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/morubitituxuwozinukekob.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/mukerifowinotosexaruxin.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/56909395075.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/1258e82cb198730e937c89286a4568f9/58560066712.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607879d69220a---35084151227.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/kevixerejigeruvopibagowi.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/56b7a44492318e5dbd1be3150f598876/bejovaroti.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/53decc1d5570494b0e0e3abc7ccc22e1/rivogisi.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/08f90356ab2950db5195b64ba26e45c0/39097006953.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/32529607589.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c921cd3701---rawowomolaje.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/texuxeseseti.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/kerexamal.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/65808419112.pdfIn PDF document text
    • 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_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 17536 bytes
SHA-256: 401a506468ae6a56ac6bf7027ceb53fababee65333ffea3132a1d8b0bd4c317c
font_01_sfnt_off00012366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12366 11240 bytes
SHA-256: 4bca3f114b41a971a0fd734c0b7f515110907e987e8ddf3bb605e6d1a9e4e2c9
font_02_sfnt_off00013d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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