Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5321c0ea8e9ea10…

MALICIOUS

PDF

76.4 KB Created: 2021-06-30 13:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9ae8d6a8d0223f6197783c0cd2cbfc2 SHA-1: 09d12b683d9fe325e9388535777485add47b2b5f SHA-256: c5321c0ea8e9ea108537f7b20856144444a2f3f5f38fdc0473320bf80f121123
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and link distribution are consistent with a malicious PDF used as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://medvor.ru/uplcv?utm_term=the+worst+suv+to+buy
    • http://sumbulefendiegitimvakfi.com/resimler/files/lafasejeregotaw.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/3695766131.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/fajosuk.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/548dd822amserdsqqra0iohtmn/49289685601.pdf
    • http://giasuthanhdat.vn/Images_upload/files/95658309511.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6019a6cd40---buzomoxoni.pdf
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/93792804610.pdf
    • https://ladangmimpi2.com/contents//files/fuxidoxof.pdf
    • http://wabasnb.com/files/fckeditor/file/115909188360b3fd4dcc8de.pdf
    • http://dfwsedan.com/nbloom/fckuploads/file/21163094684.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c668d045e91---31324406294.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/04cdcf040f943c54a63ff3d135d6eb7b/bopimu.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/8523745835ddabb142522a6da41eeb04/kixexorusikigerebomapij.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a4874dc62---roporegujufalolajogo.pdf
    • https://dermatologie-chamonix.com/userfiles/file/82302519460.pdf
    • http://karunb.com/UpLoads/files/70281432422.pdf
    • http://www.klimavill.com//data/editorfile/47325272092.pdf
    • https://amitadevnani.com/userfiles/file/82360212836.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/36ce4397288ac33f7f5a66362a60b2b2/8845914943.pdf
    • https://egf.tw/test2/images/file/rijupun.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc962af5ab---gesugizelodit.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ae19d25def7b6c7b729b2ed08e46e3f/kufoxibusexekudilil.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/4bea5e364a53ef57769728768cf1ce94/76910923461.pdf
    • http://texmet.pl/userimages/file/fugurudafisebod.pdf
    • https://plentis.eu/ckfinder/userfiles/files/29845358487.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_off0000c8d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D1 16792 bytes
font_01_sfnt_off0000e0e8.bin
fb533727e6e4501bd5263d0f235ddea02d751512ac65e55d88c4c1e774c7a9c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 10272 bytes
font_02_sfnt_off0000f84a.bin
410ac88317e06663c99528ea0fd94d9446258edc563205e2d516abd8341abf40
pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 16748 bytes