Malicious PDF — malware analysis report

Static analysis result for SHA-256 3407c50fc9ea3fe5…

MALICIOUS

PDF

83.1 KB Created: 2021-06-29 02:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6256ad485f082dca9686c386fe6f2b84 SHA-1: 83caca5e4632a5890310abe6acf6f10b75553b88 SHA-256: 3407c50fc9ea3fe5fec6b448bb8410f4df55412b36fea5ce6696686c336bff48
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting other PDF files, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607567ddd0977---lofemekavevoketato.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1baaf19b3d---98915001363.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/19071861ed0d625ea0aa6d106fea17d6/viwenupozusopituba.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4e68a284a---muxedob.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160798e0e3db78---temonuwuretuzum.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072705b24955---topuribeneboxomupunopi.pdf
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8787424851.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3193db6a7---63286366876.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ab70d69644193df61655ccd0670074d4/pemev.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd70872db6---tatateguxejakesu.pdf
    • http://olympusflights.com/files/files/42479561667.pdf
    • http://forumcutuca.com/ckfinder/userfiles/files/31330456763.pdf
    • http://amexeuro.com/an3_Uploads/file/ruzopazefifazaw.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d203656513---wimipukajitaji.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/14964b0d8e56bcceacf49464d8b78208/zujalituga.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f07c9736a---41425902465.pdf
    • https://hrmconsulting.biz/upload/files/fuwagilitotibegepifufe.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/jm398fpk0d97db16oflmfen8jg/kixovotijeximexekem.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4abe79223---15212213991.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08a1c5059a---dutubezeninedew.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/119jhd7c708r3qnu7ssgnmdj12/97571036785.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e09e6bc87---rukaduwow.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae967cb7465---dokewasofolu.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/gmpviucd5ftv1v3nditv4h62s0/21702900.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gearbox+oil+level
    • 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_off0000e5dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DD 16792 bytes
font_01_sfnt_off0000fdef.bin
6f7e57ce06a7346a2338fcbce8f8c2dbd4def63f5d15bcc89fa1377c4f53ddf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 16488 bytes
font_02_sfnt_off000128b9.bin
1bf892df9aa4f9e577f3515756a2cbcda68fb06e762fd460c947516b05937b14
pdf-font-stream PDF embedded font (sfnt) at offset 0x128B9 10080 bytes