Malicious PDF — malware analysis report

Static analysis result for SHA-256 78637ce14054ef78…

MALICIOUS

PDF

86.0 KB Created: 2021-08-22 01:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 1ca77bbf3019eb825ff803462b42682e SHA-1: f06fbca8e4d5c324306990769022f3d3e9701976 SHA-256: 78637ce14054ef786675dd8ddf50aa3acb3d29788fab5952faf7e5955480981d
164 Risk Score

Malware Insights

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

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 presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0d5cd0af5528df3b36b36ee2357a92e0/58336076833.pdf In PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a489ee3fe---30818023114.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210814_C27AEE4721764CF0.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/kixili.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/9ad80988de78dd659bb5115665b7f6c5/55541643216.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8aec811b764f62c70bf6f4f98fe6cee3/18667845433.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/jv70o504q4jum7b7q3jpncgo90/zodubavobijosowe.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/3ba39b60eed154a4d6340a132baa8294/lidibijaranuzetiw.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/korowofezi.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcc69d8bfe---17700920985.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4471e9acf240d61142a81ac9eed993e5/zikutonajarepevazad.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16090c48406837---kakodixotibidinafi.pdfIn PDF document text
    • http://jarosi.hu/files/file/kopudojidevulono.pdfIn PDF document text
    • http://pharmnet.cz/ckfiles/files/files/kotujimafajaberagazumaxa.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/xejafufasexezoduva.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d229b0fd2---45770046207.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/wudisarikoxozabep.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/e944bd88bf6b250e4668f24400f928a9/53923867477.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080323b0bc61---rudakizimakotat.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/18464385862.pdfIn PDF document text
    • https://iranjobex.com/cache/fck_files/file/sakuragotinigivad.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/tixotafezebujovozojonidi.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/wimerorejatilebufemeleki.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/xumuvojoxedetidetijebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sivaji+the+boss+full+movie+tamil+hd+1080p+download+isaiminiPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 11644 bytes
SHA-256: e746fa8051cd10c6c8131a90e3571fb671890115be5519481d2dac1eec947da4
font_01_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 18040 bytes
SHA-256: a7566be2390906519f71cd783affdea774adb557dcb9447edc4b3abe6872c396