Malicious PDF — malware analysis report

Static analysis result for SHA-256 107bfde3978ed81d…

MALICIOUS

PDF

99.6 KB Created: 2021-07-17 12:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8641f7963278854792c9fd4ba22bb70e SHA-1: 8a90b5139b2128edfbd88c78e24ef719c7fd8200 SHA-256: 107bfde3978ed81dddd586350ed055df812332739ed132c5a6a5cff2bcd3b2cb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier 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 heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://anakmeong.com/contents//files/nikugopefukeve.pdf In PDF document text
    • https://diarch.in/WYSIWYGImage/file/setegixem.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/datezilufalon.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/gafatepijomasobukexozi.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160948e0793779---ridojakujojabopulenuf.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/25584591637.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ae949c340a7597ae2ebbd9b65e55681d/79206280004.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/jiduwurozibigumagetexusak.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/79616425987.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/jufopugadadexobimo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f92d7eff6e---zajinutad.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/9c20c2cb73ee1f00fea781f35a218c1b/pofifilawef.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/43795792811.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/20384206564.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bbad6afd9---46784382511.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3041ca987732643aa6f4fcb83c6c0d89/zafunikotamaze.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ttcnv2eris4m1tuspq8bf3ak4e/xiwujixofajugatinadabemez.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/23316a92562605cbf0babde58e006fbe/luzugedobijupadum.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/4611962e4b528dc4f947e109296fbb89/6735407840.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/87604836767.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/a9j44k2vsifq4heuju5l2edf65/disoditanaze.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/tetuvevabukelo.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e1aa777c2---bosifokopanexutadumina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+you+respond+to+how+are+you+feelingPDF 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_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 17804 bytes
SHA-256: 5eb7db2c1d739f5c3965113099882e5c1fb4b71b9911404d4599b83eb23da6a4
font_01_sfnt_off0001505c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505C 11068 bytes
SHA-256: fe65a2b26140462ec1945e6d36b3dfdc27289e21a14d6a0048f379cd9f283c90
font_02_sfnt_off000169e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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