Malicious PDF — malware analysis report

Static analysis result for SHA-256 9913ea5123445a15…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 13:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a62d33534d9971e2cc002245f532a9a1 SHA-1: 82f046aca2065c1aaa30940e998c47ab6a845aac SHA-256: 9913ea5123445a15e53c98e60542712d7a5babe5ff1cbb3afbe0f446bb37f243
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, many of which point to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the redirection or payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=to+the+ends+of+the+earth+hillsong+chords+pdf PDF link annotation
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a10ef878b9---68213815646.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f55e0e717e0---97128793432.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3411cb615a147011c43696282d5e1e14/rilurigovupiwatopebave.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/joxipuzeg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80e3552197---14130964318.pdfIn PDF document text
    • https://ladangmimpi2.com/contents//files/94220571440.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/sc50upgl68ukqnq73u422jtvr6/dukewutujugosujamunejup.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1610adbe10333d---libilagasoxob.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/jrsasrtt3ga3huch7bklvsgf5k/zubijasofumotawazawofemav.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/mevetaleporoli.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/wulofewenexuk.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/wasige.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/konuzukoxol.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/kumegemupotoxane.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e601d5418ee---86606420570.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/73508430304.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/82752651580.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f037229ab---5409088725.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/86473116466.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/wubukozofalowigo.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/160a6df84d0e50971c6454dd779d5586/75263058548.pdfIn PDF document text
    • https://marosme.ro/hirek/file/86055567394.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9246a50f81---13604278576.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c6f6b993---sirowozifidenotasin.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_off0000c50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50A 10864 bytes
SHA-256: 4fbf5729cc99edc8010870864bac4518b6b856f073a44ca1273290f7fb049132
font_01_sfnt_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 17380 bytes
SHA-256: ead8cce9fb0e5dfcbc3f54c716297992599c59a016ee32c4e8ec1f2442ab12c5

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