Malicious PDF — malware analysis report

Static analysis result for SHA-256 2257da20ef738fff…

MALICIOUS

PDF

69.7 KB Created: 2021-08-28 11:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eff11a7b724d4a0e2e37b1b739f8e107 SHA-1: 114443e8a3a4a6b671476f75afa7694b7f71147d SHA-256: 2257da20ef738fffdb466d5885e1bb0e4b1b224ee9c9be5bfbb0c747f99469a0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and disposable domains. The primary purpose appears to be directing users to potentially malicious content, such as phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=exercises+to+increase+breast+size PDF link annotation
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6c25433a5dd99cc41869a8646909a0c6/mutositibube.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4eb488392f525a92ad6b4984a28c4e69/vipuvigizifajovimogelume.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/zafojasiduvol.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2a9223d72---55574918142.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/tavimaxa.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160980eecbd352---lekoragodopaxitugis.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c748ebf7e---72734874242.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/24915679824.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/rowazewosamubu.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97677690794.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/mawepaxumesufesajokujebu.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/mjontvuh7kf29hit0gi6o2445n/5146657189.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/sajixukututiterelemopewip.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f235d499e7c---zodop.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/dr0uo9ojgu0sgjaivkv43uirk7/80060860563.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/19473766542.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/mepetuf.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/zatajejiwugefuju.pdfIn PDF document text
    • https://altbuket.ru/files/wuzume.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/75444785958.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16268318041213032729.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/bubaw.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/rkn4bdbnjv8a9j0fogicakccn4/14245402704.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_off0000b3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E5 15032 bytes
SHA-256: 785a960a8369f6ed678d3cbf7d56cf1844a9332361f7a975d4f627fe2e5a6a1a
font_01_sfnt_off0000d981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 10460 bytes
SHA-256: 29e877aa7d4240286d8f6ddcbfd49ecd7f30a112c4ccef4bb38dde4fbc60b7ef
font_02_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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