Malicious PDF — malware analysis report

Static analysis result for SHA-256 758373c950ea842b…

MALICIOUS

PDF

157.8 KB Created: 2021-06-29 08:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88f27b139268ad788ee8641866d10273 SHA-1: 20f7f074839cb55586d233bb648185aa312360ff SHA-256: 758373c950ea842b6aa13c7d07688b0a0f8db13dbc854f859e291e09121c0ead
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=dog+in+xhosa
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5619e2cf4fdf08d67282ab639e277ee4/sopivasebido.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/4420c7f658b65eacaa2c6664d7e5a501/mupedo.pdf
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/77652053442.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1852b608f8c083bb7ead29759ce533ee/25429027666.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c07e5d6501---wifidixavuvanitodiliz.pdf
    • http://yaqeen-eg.com/userfiles/file/zivatoridifisiroravor.pdf
    • http://polish-house.com/uploades/fckeditorfile/94600572737.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/tejujuf.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/zobinameta.pdf
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/75010292450.pdf
    • https://ancoraeducacion.com/images/naxixuxadawa.pdf
    • https://aashianarealty.com/file/judaneramefuvebomudibup.pdf
    • https://sonntag-immobilien.lu/userfiles/files/96182678438.pdf
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/wiluvabarigatetujilosa.pdf
    • http://makesomenoise.hu/upload/file/kofuza.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcc64df795---53400289749.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f33a473f5b---4175228484.pdf
    • http://rld-carbon.ru/file/36446385470.pdf
    • http://beateromer.com/bilder/file/pizobetenukivaj.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160782c2805636---13656678886.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/451366beb461133500fe0b220f9cc2ad/sodarotenitudaf.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609102f00b1bc---33884968237.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/giwuxapuxuman.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/23b565e83974c74d0d4bb24ad0baf55f/nojebonisadazavezivis.pdf
    • 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_off00020588.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x20588 16792 bytes
font_01_sfnt_off00021d9f.bin
c57e3b142fe87e3f35c1cf1c0000211018eef80eeed0e6d0e3b268796606ae0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x21D9F 10112 bytes
font_02_sfnt_off00023416.bin
f33b2e5d7976be9e8036d2bd50c33b1ec53bddb832a6ce7d40ee2c05951f9a28
pdf-font-stream PDF embedded font (sfnt) at offset 0x23416 21340 bytes