Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0340482797ede00…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 19:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0d57f558eee2502f1aa4ad0157a8867 SHA-1: b71896be2c320c165be0dc740c02d04c464168e6 SHA-256: b0340482797ede00b074bab1b65f44065785eb48a11fd302d206c89fa95931bf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e9ed938d5---91568280763.pdf In PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/e91de0f065b19d1033b0e46452f24677/lonaw.pdfIn PDF document text
    • https://blugarden.eu/file/12646668909.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d373363a2c032289f71415645c55d3a7/sosadawibene.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/benuzofutavuxedepujulaj.pdfIn PDF document text
    • https://akbaturgame.com/calisma2/files/uploads/53428822759.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/zusevo.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/15abf4bf534642049d77c5729342bf40/tuwudejerekupeline.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/nefuguxokararef.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/26986266116.pdfIn PDF document text
    • https://elektrona.cz/files/file/vukiw.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ff4845ae39c2c11eb3d6a7f334f0b061/rabiwezo.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/libuso.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/90557455061.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdbf40c304---nefibolokumipun.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2urm8qs0b2072rqlue2cd3j9m4/luwaxev.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/nosegaganodagapomevefed.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/zesatezibe.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/pefinajoribajidak.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8546fca801---poweronabovorabene.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbb05130c---zafajimuruzujadojofibu.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/876ab6b415ed412e98c1f1bf0855f794/dizarolowimomub.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/15492343598.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f8851aead6c---62136495345.pdfIn PDF document text
    • http://myredm.ru/uploads/file/42031946883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=analitica+web+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_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 18732 bytes
SHA-256: 7f04d3e03205ef0fb3dd59561ea17982488a026809e6273763d146b703e90cf1
font_01_sfnt_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 10432 bytes
SHA-256: 3de8f0f4798d2d5757619276511156362578f1c48e9fb8ac755bbefa21b666d3
font_02_sfnt_off00012231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1