Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab23f064f6f018a0…

MALICIOUS

PDF

75.0 KB Created: 2021-07-01 10:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0539a0039bfac73f501ea852c2b607fa SHA-1: 81496d416158b90fa5d5d82f286d973833451c7e SHA-256: ab23f064f6f018a074fbd131960787b019f1fefffc9a31b1335a0387919627dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised WordPress sites. The primary purpose appears to be phishing or distributing further malware through these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a99ff291623ee7c256eab05d9ce8086f/17144017684.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/26381968472.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/qgi47ir48aduoreiqr25a8atkc/romidezidom.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/37703733207.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/e404dbcf1e8d492ecf8cd748af607e1e/mavuluwogajurebikilexajod.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5d7418348---47769087518.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/036fc81f055c92ff05bc263a11bb136d/41788487737.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b1578f83---11437858921.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/9f6fab6910b64fd2de04be6c4ca537a0/vumotemabavijozaxumuvizuw.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/biter.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/zoxanokika.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef9f03ae1b---nelifuke.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/velamafuxexoruj.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1801f204ed---sigozajosufizozanugowo.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/94092538997.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b8351a937---42146204201.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/55139617728.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/58e2e3e4878ccf1be31696d2577909e2/17647247692.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/foq37p1ufg33eub993mi2n5uj0/25133993814.pdfIn PDF document text
    • http://aceranalitik.com/ckfinder/userfiles/files/pijigijirelititote.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/ff14eec4ca4d1b87f9cc58041d753f04/52561460586.pdfIn PDF document text
    • http://rotang.net/userfiles/file/76544112256.pdfIn PDF document text
    • http://elitvorota.ru/f/file/25313346165.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf91c546c04---39815850131.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/96934785506.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/70059762118.pdfIn PDF document text
    • http://ccsl.asia/files/pizososeziw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=chapter+9+cellular+respiration+answer+keyPDF 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_off0000c3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D2 11064 bytes
SHA-256: 6c6ae30710c0a5bc41806c5abe4a9fe5feb5e731328359d1bd8a9de9262a08bb
font_01_sfnt_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 15768 bytes
SHA-256: aa9d63aad2ba9e5a3ac126149e1eb2488e8a8ebe0bc6181203cf5ea9e4cf20a7