Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f0430f86547342…

MALICIOUS

PDF

88.5 KB Created: 2021-09-20 07:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 73392bcf5a65fa9e329d87b9e118e2c7 SHA-1: f1d57a0fc934f13823c5174b675557f47edd773f SHA-256: 73f0430f86547342ef67b7b648f54d20327e10f69c241d9d776b8e3e11d895fe
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains hosted on disposable infrastructure, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous external links, some hosted on compromised CMS uploads, suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mxagproducts.com/upload/browse/file/gimawowolili.pdf In PDF document text
    • http://bookblog.kr/data/file/files/jovojivomagurovopozalufib.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/78088226847.pdfIn PDF document text
    • http://moristas.com/userfiles/files/26024250973.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/90301825817.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/95078420116.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/tidonolovoge.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b99d2def63---68939707645.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/86562714719.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/43805249028.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/xevikomuxo.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161396dbc9b2be---zixobizomonojatekikejurib.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/timewixukasinabavo.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/mafifizarewusaduvunala.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133f11121a9b---59826357627.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/wimoneveribibalavaribu.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/vovagopawarenexojima.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210904020013.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/cf95858f4e1f04ef24937441564a943f/nanutosixojiwalujizanisu.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/gatab.pdfIn PDF document text
    • https://dukupahit.com/contents/files/7488648184.pdfIn PDF document text
    • https://kmedebiyatgunleri.com/ckfinder/userfiles/files/komopenita.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/1485783747.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/79331293877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=shadow+fight+2+mod+apk+moneyPDF 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_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 17548 bytes
SHA-256: 44f48226eef6876d52a1d24de9e9d04a23dbef3cde122e941eb8bb84ce7c9313
font_01_sfnt_off000122f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F5 11116 bytes
SHA-256: 2766525ffbe4b018feab51c96c926cdd4904ca851978541d68e6bc8846c117fc
font_02_sfnt_off00013cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1