Malicious PDF — malware analysis report

Static analysis result for SHA-256 6611b3537f45ef72…

MALICIOUS

PDF

83.8 KB Created: 2021-07-15 14:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e99e7a6f1f8fe271eddca8d2891ed69a SHA-1: e2769333d896f00af87cd3e41b11c6525e1744a4 SHA-256: 6611b3537f45ef722ddc42b841d4af50b78a1b10934fea8a0e2933089c9c33bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs hosted on compromised WordPress sites, likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing lures designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608479a415cff---47754396681.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc013192e7---lesizolezelemikibiwejebi.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e9bd48edaf4a410895a7b9b4000aecc/9496490191.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e286397e4f8---40688273578.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a380fb1bde5---56264994740.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///bodadegunilujekivivubuve.pdfIn PDF document text
    • http://poorclarescork.ie/images/gikobafemifu.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a891c550b08d197082621925e22ed3ff/xejuxomewaxetofibi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa768a817c---lesonozoxevaxanukoju.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e6e125ce6cb02dab8969f8b08ec7200f/378232085.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/zozetanopasiwozik.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e3081b0b---bejolirabujifovaginumenaw.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kirup.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076109da72a1---biwanufifunetaw.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-14/20210514070520415120.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/cdd858532dcfa32359d99664244dab61/87453794672.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/68614441160.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/gomofivom.pdfIn PDF document text
    • http://renknh.com/ckupload/files/30734196685.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/24447193774.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160794c5a12e4e---novosiborif.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/zuligoxuro.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/fh4ldq8fbkdotupqvonrev1oht/10173509001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=baby+coral+troutPDF 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_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 16716 bytes
SHA-256: d10b247de8fb77acd59be156c0824ad71662cebb59dd4cd189de018d2469cd15
font_02_sfnt_off00012b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B53 10136 bytes
SHA-256: faed2421e026a44697d530688c4c9a42026add3ee9645efea1d13450f340eeff

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