Malicious PDF — malware analysis report

Static analysis result for SHA-256 5068dcd129d9edf1…

MALICIOUS

PDF

98.0 KB Created: 2021-08-07 15:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 91276489a28223acdd3760e6fc853c2c SHA-1: 1c0b9ed7126c349aa57fedd9a4e420db656d33e4 SHA-256: 5068dcd129d9edf1927a04b11b15216b7625320d12f4be5ac32910dc31a4562f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and link farm patterns, directing users to compromised CMS uploads and disposable domains. The primary purpose appears to be to lure users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://wastran.ru/uplcv?utm_term=ejercicios+de+demostrar+identidades+trigonometricas+4+eso PDF link annotation
    • http://kodemari.info/data/files/zoxoxofexikepetexisa.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/69671985377.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc0a9f127---bixilazo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d1e85d3508d67468030bf548e3805c0f/bupoxakezosejorasas.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/sukepazetuxezerazosomo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160783d3ca3c2c---deboxupumubemisovuzep.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/d1a5fc820992040a8bc6d588a317d546/resuxetusojefu.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765ffd5cf4b---libujipovelupurutobep.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/zuwelu.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/tiwozudaz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6417e766---51992806947.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/65ad9fc77c230b304f0ce9e73c88ceb3/rabuliwiminibibaxi.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/semeb.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbbafe1ed71---dulixoduxonajikuvade.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b342acad466---92604508886.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/mf2s9351uelv1d610t54smlesb/tawizezisafewanuno.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609949d5c398d---fititulaxoved.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/feba25607228d1e30b1c73a03d50f367/70788907212.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/76676780675.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/zeladebejisoxizunose.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/sokujufubulidob.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d0f8ceaf1---muzoxopoxuzolukujedexot.pdfIn PDF document text
    • http://bienbao.net/uploads/files/kuzogajabal.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d9601fb4c---dujaxaxufanexobefo.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075e32ed2005---9100142995.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_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 19496 bytes
SHA-256: 88354085020706366098822b9fc06241e15847d218c446de35d4badf4678f2a3
font_01_sfnt_off00014682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14682 10856 bytes
SHA-256: 25d84a5849c16281a6c51e9febaa5ccb767ecb499a323002894a440f02867fd4
font_02_sfnt_off00015f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1