Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc28bbc278beca3b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 16:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ce41f0f55d71e18220f9e1447647bca8 SHA-1: 985b258cb1858527dcef9b0fd28a7513c0468c95 SHA-256: cc28bbc278beca3bbe8fa6936eb19133544a8bdf08f5ab4d2cbbe5ba2ab9118d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160db94d57459e---wegitinub.pdf In PDF document text
    • http://renovator.cz/files/file/35255679970.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/ziwoj.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707499c1bf1---jemuseto.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/6920308419.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/894f902bfdf1a59b28ae833faaadf002/94051661585.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/61482996317.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/da4bb41d5e0e2e1ebaada00ed746c208/60575590676.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/pagazerudalurunimufuxivet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161289f86519ba---57768783541.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/sidopugozopefova.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/gulifowizuvepekatunuraf.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/23807839435.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/23907975402.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/nilokotujog.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847f897f41f---sivizeba.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/pikemonatupalugapovozamum.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d300780b9b6fe8955af71815381abe5f/biduwusamutako.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9622e296b5---lumejavuxotebanogad.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2360345836.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/660d4f4f49157e54735cb844af4bee71/wujavixozodo.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/rogel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=como+convertir+pdf+a+word+gratis+en+lineaPDF 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_off0000d0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FD 19116 bytes
SHA-256: 4adc91e38e6fbe005b72ef8ab9e224b763ad5f7b90143d12ad1325a87f1ef9f6
font_01_sfnt_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0A 11148 bytes
SHA-256: 87cd8f00d25a1b9d4fff8410d24179a2a879ac6c18e4f37c3ba3b156410a822f

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