Malicious PDF — malware analysis report

Static analysis result for SHA-256 9738c19b2368e98d…

MALICIOUS

PDF

75.9 KB Created: 2021-06-28 16:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a86d75acc4aeb1567b3068c06116d822 SHA-1: e8305d9f697319ce7370b1bef8ee3b53e5c9aecd SHA-256: 9738c19b2368e98dfd848ba29cefda6c27714a0e9d935a4b0ea715bd3e0a8a2c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=pic+to+word+convert
    • http://bydnjl.com/userfiles/files/kisisumujojim.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160d976734d920---rovibifofeteruwapipa.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c5a785df4---41132676335.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/masejudowedofo.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/64eke39aki2mr94vtq5q9rpc56/mivabiwupikegotaj.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f36b955762---6200928241.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/fbe1f3ae5d904f1784d1de6ba9e1d816/gupigodisagux.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/734441795cb5c2c746945861a7bd397d/bupikutulibasiw.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/90444331282.pdf
    • https://martensmgt.com/business_school/uploads/file/82026916089.pdf
    • https://ludifrance.fr/userfiles/file/notidokotolu.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/5f3f1225b0f810e88be13bda45435492/16472978734.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/pitudokux.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14064bc934---sefizeva.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ffe5176d1417adef4c6abce4815f09ca/fijopedavabexugomobefafir.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/82126722819ec04466b3801ca0d3fd4c/57502570602.pdf
    • https://weyergans-hcc.lv/userfiles/file/kobakora.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd53fe1f10e---lulirojirota.pdf
    • http://pspectr.ru/userfiles/file/83183053587.pdf
    • https://rybczewice.pl/userfiles/file/27431608500.pdf
    • https://samarpanbharat.org/trila/userfiles/file/luloxatefora.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b14838968a---kezuxa.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609bba8f283d1---zikevokaseg.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c91d.bin
4a05970b77aef93a3c9b1cfb625ed64d1724abe2189b5fd2de5afa672aadb3f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC91D 10140 bytes
font_01_sfnt_off0000dff2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 16792 bytes
font_02_sfnt_off0000f804.bin
d35d0a7ef7c8563283c1170d1b0ce75edb488e84310177d46b9455dac1b89cff
pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 16328 bytes