Malicious PDF — malware analysis report

Static analysis result for SHA-256 e134cbd90fbca6b0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 03:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a2a3f6dbeb061e52fc819e9299151d3 SHA-1: 1e065782aa12eb12b14609256cd0cef878bc4beb SHA-256: e134cbd90fbca6b06c1c9bf2bbd0bc6385d6ae157517aa9078ea730b443bf31d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, including those hosted on compromised CMS upload directories, suggest a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=justice+league+director%27s+cut+streaming PDF link annotation
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/45e6812130353f8084b3becce233ed92/37474909237.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/zubabokemomafujuv.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/tixoxirufepikujin.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/54750421385.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/muvefoware.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/tajivareganasovuxuwelop.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/wunavuwegaxuj.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145262a343a2---88434491412.pdfIn PDF document text
    • http://marketingnews.fr/images/file/wosumozit.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/499583f084a031600d739f22371d2d2b/74110079458.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/vitaranusezexal.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/5283040474.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2200799d---kuriderovosuf.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/37035858294.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/29230853773.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/zamununubejefakipodejid.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/gezujevewixodeki.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/nilebokudijotir.pdfIn PDF document text
    • http://idroter.org/userfiles/files/51965081243.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/xebupesijogazirolanubitiv.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/18771474269.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614518bab5b15---jizox.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c9b94abd6ecd3731118a0b1c39f90fbd/kifovazumenulogusomubibim.pdfIn PDF document text
    • http://elitacasa.it/images/file/22276414596.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/netudenadodawovas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 10840 bytes
SHA-256: 9e6263f5b6ac8ac88b50f663e76d3e96b4bb1db6e56ac35e9dbf8fc2dea60b19
font_01_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5E 18028 bytes
SHA-256: b4e7f59170fefee0a25b20618814667411c2e284be2f091e83cfebf391127b4c