Malicious PDF — malware analysis report

Static analysis result for SHA-256 953239688b4b5ab3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 03:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f109ab872f3b04753ac1b9235e386a4 SHA-1: 90439cb9ff9eee71802b7128b8faeaf656535966 SHA-256: 953239688b4b5ab32e02b88ffec71dfddba06d5e232333d69938032c83fbd6c5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or exploit delivery mechanism. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are consistent with a spearphishing attachment used to initiate a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://montagnobozzone.it/userfiles/files/kaxibewasarapasutabewu.pdf In PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160953b4e011d8---7918429533.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/30834590050.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/78254331906.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8562ae9cd8bbeb46f09af8a7cf74932/juvekeburujigudejikap.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/lojiponep.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/jumojijibafazupotulitux.pdfIn PDF document text
    • https://parfumzone.ro/files/file/55587047429.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/sixiraf.pdfIn PDF document text
    • http://kingnature.ru/files/files/9592805284.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/mokolopevodorokusegaros.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/10985588749.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/88292063359.pdfIn PDF document text
    • https://nada70.org/userfiles/file/6764728821.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/93319864007.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6c4b8027f---46325852369.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0tutni10ugvnsqrqan0hejhh4s/korupovevetupabedomogi.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/a4pqa94ovs6g6joj39cmkiqo96/mesan.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/73609207656.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ms8o15tf6avioaki7ma3fhk6m2/1451820392.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/8ebe0e486adce5127cbc3210595f5adf/vexonorekulib.pdfIn PDF document text
    • https://mszukam.pl/dat//file/gozigarulawukided.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1cce5732---vuwarisuxezamoxir.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa15a079e---80279330119.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/89296645106.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/xuxapugufexelobivajoniwuf.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/iubokql6f50m06ac4cve1jpcfu/89710042112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dlsu-d+entrance+exam+reviewer+pdfPDF 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_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 17544 bytes
SHA-256: d4cede09d0f3fe75370a5cb19470571325d764e2cf6ad4d5c9fddcd29be0beca
font_02_sfnt_off000127da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DA 11048 bytes
SHA-256: d4ee495a3f9892416c02fc22e420a14926eeeb8fc52c514eb622582a8c0bf2f9