Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef57f97497eb0d6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 01:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9420891dc14cebb7bd4666998b55c8b9 SHA-1: 499749a6d3384a1e5932905ed3887612a33c2bd7 SHA-256: 3ef57f97497eb0d6807385cef5cb37b2ebf3a4affec9204259ca99f95763f46c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laetitiabernard.fr/images/file/65787626338.pdf
    • http://noclegsosnowiec.pl/eurostyl/photos/file/30232176279.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fea2a007e4a8fea257991f9466baa445/33178623148.pdf
    • https://cargotavio.ru/files/file/tawexodawire.pdf
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/rimopexurudovokipekebijoj.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8504056c---20688470116.pdf
    • http://vetranhtuong.info/luutru/files/35251840429.pdf
    • https://studybrilliant.online/app/webroot/img/userfiles/file/fomuwaxisovevikiromijivus.pdf
    • http://rucodelniza.ru/userfiles/file/14256508743.pdf
    • http://studionegro.net/userfiles/files/30826135218.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/k8g8ebcr6f7qnpb8uhvtbrdvka/folopumipofu.pdf
    • http://logicamail.it/draft/media/81303319219.pdf
    • http://sarljarry.fr/userfiles/file/44536419190.pdf
    • https://lbjgold.in/ckfinder/userfiles/files/52557861604.pdf
    • https://butchercurnow.com/img/shop/contents/rulukawowinapalopig.pdf
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/xisasedaguvuwube.pdf
    • http://densayhongngoai.com/uploads/userfiles/file/kizevuze.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613510da09d04---57313902169.pdf
    • http://nessium.fr/userfiles/file/81695279938.pdf
    • https://scout-educationguide.com/userfiles/file/fibewetanazesigoj.pdf
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/tomopimoxiv.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/722692a9815dc2d298f93319f6201a8d/56631267661.pdf
    • http://wct.goldcrownresort.com/magazine_files/files/11458282490.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee19419ab---gepakazugitut.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/2e9a0ddb1fdeb8b654c61aa186f70681/45967090300.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=termux+games+hacking+tool
    • 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_off0000dca2.bin
6632a14d5668bd57e2f00532f4073f4cfc08cf09ed2a8a2354d8b0b47a199108
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 17208 bytes
font_01_sfnt_off000108c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 16792 bytes
font_02_sfnt_off000120e0.bin
3f38c04e9f0965db36cd51cabf9aef047f5aecfd1c9f36b90784573f5a0dc276
pdf-font-stream PDF embedded font (sfnt) at offset 0x120E0 10932 bytes