Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e69534dac0b19c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 10:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dd1a4701d5ef21003a9f4be439557f8e SHA-1: 84f35323e54d8492b28441c668fe53bce2f2e90d SHA-256: 23e69534dac0b19c19c4f7b744ffb85be8cb898ccd78f9234140f665a7445e28
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/topapetadubenatutikabimel.pdf In PDF document text
    • http://hyundai-dongdo.vn/images/files/82055748187.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/memixede.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/hi9o6105n0u6mkn5e4m38mmqjn/zosalesusegumuwege.pdfIn PDF document text
    • http://podarox.ru/public/files/479463966.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe06ce637f---sojoteliwu.pdfIn PDF document text
    • http://laduses.nl/image/file/kagamokuvemizojelaxil.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/susoxadoderus.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c71909983---nuvexagiko.pdfIn PDF document text
    • https://isosklo.cz./uploads/44440891470.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/15826219711.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/61034052662.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/85319132228.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082797bef3fb---tizovuzepomi.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/rjjbuhmhckgls64bpqmmok5gni/40192683446.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9ea4cca93a84d7bde0b665b3d7acfd6/falapixefuwopaninetozidix.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/kefosi.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/finolemow.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/skuc96ksn24fcp7nh3vja7jm0n/1515980738.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/90738291921.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/seguneverutodivumipelul.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/fb7dbd3032c14682bc7262966baa0ccb/kizudamodi.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/mowokezifagibixana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ejercicios+pilates+principiantes+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_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 10724 bytes
SHA-256: be9b3ea915b4af8070c794f272ab8497763fa35575fc10bb096fc1265d4a12da
font_01_sfnt_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 18472 bytes
SHA-256: d51e78e5558b8e225838bc61e8159233c5c7031d147bbcd6d6b0915f6b83bec1
font_02_sfnt_off00012408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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