Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82b3f6aa05e23e5…

MALICIOUS

PDF

101.9 KB Created: 2021-09-05 22:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a3da24c443bc628a7240e4abd3b927ac SHA-1: efa66597d267690c73a224e24a29ee310c65f078 SHA-256: a82b3f6aa05e23e5307ea3b883397be5cae8f4147e6c857b4f47fca62b2c7c02
164 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=arap%C3%A7a+kelimeler+pdf PDF link annotation
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095388d84dcf---40151021057.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16125a591b1800---74542418011.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5893674d1---kuvavegezaro.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f958845036b1657ad5474c0eb5cb334b/12149355479.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/poduvukogokaxerenoruw.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/zikufixonagolemixanasexuj.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/lapozuwomitos.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/lidefiwanorovuvupebotem.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/76764267418.pdfIn PDF document text
    • http://biomehl.com/images/content/files/resixezenakevesavabofeza.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/ginupibojurivugaliw.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/deketoj.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/86bdfd26169e9ecbe46dc792ae477bb7/89160636169.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f753fd8af446942ad09c094b2aa7756b/babavuk.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa4c728691---58232479172.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092dbb442700---23165246491.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/83d5b76d9bfc74b2d799273deb985753/82005323717.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/9pr4n222bq7qr2g8mbrrf94i60/16534489712.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51d3548347---4686191364.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/juzegumowetomuwupudirokaf.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1328d1687f5660c17cfd877864db810c/31066425696.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/43994168960.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/tenofevuted.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wegamavawopakape.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
stream_004_off00013aa9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13AA9 30192 bytes
SHA-256: 001da1e8e2f20b26fcf0d9b92cd92e7048970d5c120e4cf4ff7a6a1fad7d5332
font_00_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 19748 bytes
SHA-256: 033eb32a850ed07fffb3bf8d2d9c3409a15a6774cbcf70f4e51e6a49f74d483d
font_01_sfnt_off00012298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000170b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B4 10440 bytes
SHA-256: 872ef077d78fe3f1bf93f08c8f7ef06acb59655f9cd84acc9067377d5ca4450d

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