Malicious PDF — malware analysis report

Static analysis result for SHA-256 7436a3549271a63e…

MALICIOUS

PDF

156.8 KB Created: 2021-07-22 09:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 01c4e6ae7a27c828075df23e7ee84f26 SHA-1: bd6edac8d4042475d302dcc1f7fb281a8e4b1426 SHA-256: 7436a3549271a63ee819ac0431a7a293d7341673929b354a946640cb2259b0b5
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a malicious intent to distribute further content or manipulate search engine results. The ClamAV detection and ML classifier strongly support its malicious nature. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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 http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kroqjosgh5sa9vh0pcjulasv71/tifafalelevelexo.pdf In PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c46a35019d02a992f1b89c4522c65f5e/zozivitosetaziwara.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/60054894719.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/70850027692.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68117629b---sidalofekevogezapip.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3afbd791---zijilejewikijuvotiwadonev.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/85ivbsi00utcl28dk82lff784v/suvot.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079888811b56---veditarus.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/72439899742.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/74037358253.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/80647857871.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b3de4d50---todilid.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/97879668321.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/57400175198.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/sudorewakasiditetizuxudo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160985c6a2182c---98407201388.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/2c26c00bd67687f205d75b540eafe0d8/xewefedexuxu.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/gegidetariroziwife.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/92088018278.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8519f973be69f71825e4a27ad4f44f00/gujidolati.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/geginavesulegajugab.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9d410c5284b13902215492fd573bd72b/ribux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=young+one+of+a+giraffePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00024cc8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x24CC8 16560 bytes
SHA-256: 18be9bb38071d221ba90bcce01faa027fdf3b20307e59e87608bc277d70c2ab6
font_00_sfnt_off0001e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E64F 21872 bytes
SHA-256: 9bd677090fb0c015f51a60207459e5d2fa389f0c6374dcb36dc624fd4f88c4c3
font_01_sfnt_off00021dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000235eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x235EB 10160 bytes
SHA-256: de4ac63f33d6c4439788e91c60a78ac78e8a1cfc9b6a15a360b4eeef53cc6673