Malicious PDF — malware analysis report

Static analysis result for SHA-256 b170d1e9803ae8d9…

MALICIOUS

PDF

89.0 KB Created: 2021-08-23 16:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: abc4a81793e9523d91fb83f304faa59a SHA-1: 67fdebb3d3e31504f5c08a8904926eb9358fa828 SHA-256: b170d1e9803ae8d9b0264b4555f0d151b9fa90d1df2c396fba3ed7a656b8b938
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=ms+word+cover+page+design+templates+free+download PDF link annotation
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16109c25599d26---25126026207.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210731_834B040CF62666AE.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/40276445585.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/monomovazajobimenuselenij.pdfIn PDF document text
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/2457617348.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/tezavojudatifek.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075bfed865cd---benijolewuvapisuduvitefu.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/61681923238.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210817_EBE8398D3F78A9C1.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/64223350812.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/178438b2a82062d2beba0e1e1105452e/wujewobawezidon.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/nizakovu.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/zevekuji.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/00bit3br1nckqmedq08tkfjhlj/27036785513.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/4ouvf906rtir1e3d3kmb7di2v2/wefixi.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e546d681---bafaleluna.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/13ff84c645aa3a90708c1665ece7807f/19983485429.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/14195544815.pdfIn PDF document text
    • https://soechi.net/userfiles/file/waruwesatirukuferejemotez.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6bb46ddd---gebuw.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/nopuko.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/42ra6u4ng00odracadj9oeisi7/xefowofesaduvem.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c205f385ce7---gunuriporofo.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/jewuzomumanewadivox.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021073117232173499.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 16536 bytes
SHA-256: 7c664965a1317dbb25d87f6255e8007ba934701603b1c2a5b988bd68db707f11
font_02_sfnt_off000125ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EE 16080 bytes
SHA-256: c9fa871d706934500ba7362bcc2679cd089fe7f1d29a584b92b55675ed6be739
font_03_sfnt_off00013b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B17 11108 bytes
SHA-256: 937b9df7426bcdcd0bce055414875558e5c5f9171a54541f59f1c76a3bdac2ac

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