Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4db0b021c77c16…

MALICIOUS

PDF

102.8 KB Created: 2021-06-26 10:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51a81a1599dd898a4e571265eb4d1f8b SHA-1: 65e5668a37152e821a89980b6ba60ab9551cb5b9 SHA-256: da4db0b021c77c161f8e83775c6b681c34c56a4dc03965d6ee0d4543487a8fe1
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest the document is designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://fabtur.ru/upload/files/50226698759.pdf
    • http://sva-jeanroze.com/xmedia/file/38670694015.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6ec457f912e8b342a58b983867a4e459/tidozirop.pdf
    • https://stopserv.ru/files/file/83019887390.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1524bd044---44241963346.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/cd229744b29bae6226406ff919c04beb/fubejamezozufimokixuk.pdf
    • https://peiitw.com/Upload/ckeditor/files/viwojedobaliluzazulen.pdf
    • https://sieuthigo.vn/upload/ck/files/rikelaminanifugibitogeraz.pdf
    • https://virker-ikke.dk/files/41940357220.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c766a73323---22278823225.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160991cb43ef45---tezadibelojake.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7186791c50a86550a3893ffcd53b9b76/58205336933.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608643a2690b5---mokewikodejusulo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0bb0efe5f---81480255807.pdf
    • http://lab4050.com/upload/editor/file/vakiwewu.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4f0ddb63---84071851430.pdf
    • http://muslimofwestbengal.com/mwb/editor_upload/files/goxamoxikofurelapisuvivel.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c07cc0c73af907284c84c9df0701e442/83209777881.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3a872dea0---95235059719.pdf
    • http://wecans.net/_UploadFile/Images/file/tagezib.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f09c9c3214f678f616d4b1d9288ca475/fikarefakavokasovab.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf8688bb1---tikoro.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdc766c86---tisuroworetamozowebuzelol.pdf
    • https://ludifrance.fr/userfiles/file/88321453779.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kala+azar+disease+is+transmitted+by
    • 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_off00012a95.bin
d057e801118504d507f67bf9fd173c6dd8e95c0d837134bf0aabebb6b5eae8ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A95 10596 bytes
font_01_sfnt_off000142c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x142C5 16792 bytes
font_02_sfnt_off00015ad7.bin
cc2ca7c61eb1285ef091164df614f25e8a02d3ee15e56f96bf8ea9beebd1c9fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD7 20436 bytes