Malicious PDF — malware analysis report

Static analysis result for SHA-256 721308d4189ef302…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 14:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca2e3f20b6b08b2969c1cbaf2a276394 SHA-1: 80e018fe1644b914d43773c85aadcd9180376594 SHA-256: 721308d4189ef302b7e68475d1e31704caba769c72db82155f28d49f8a4f3665
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress uploads and other disposable hosting sites. These links likely lead to phishing pages or further malware downloads, aligning with the characteristics of a malicious document used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://smidgel.ru/uplcv?utm_term=free+4k+movies+app PDF link annotation
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/kisenigokoxopalugox.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vl6kticsjb6pe99ddpnl06hbd0/41894939048.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/98292525133.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109081932167087.pdfIn PDF document text
    • http://yoron.net/up/files/bamonajok.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309526e6fe3---97546488259.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/63618486559.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/75536796315.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161446de51724a---38964763746.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/8867840815.pdfIn PDF document text
    • http://protok.pro/upload/files/18782251367.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/86237776517.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/41181899853.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/fewimosisewutomil.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/43582444838.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f63b4d059f---5881668647.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613575b196a01---46240991469.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/88229803473.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c14e0568b2---76595051707.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/sixanopejabev.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/wonilukazisusuxa.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/lawazileselumarazudapuwi.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/kaxide.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/gubatafenenixer.pdfIn PDF document text
    • http://julianina.dk/upload/file/41585471199.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/16818343813.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_off0000c24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24D 10380 bytes
SHA-256: a69c3d84ed192ce7bb6e5567009d33cd10aa268e697f664b2f7e32677fa44609
font_01_sfnt_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 16944 bytes
SHA-256: 7349b586923ee3cedeb2a90baaceacf835bdde3816d390c473620aa22bdb10ba
font_02_sfnt_off00010549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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