Malicious PDF — malware analysis report

Static analysis result for SHA-256 543ab082d70ac313…

MALICIOUS

PDF

243.7 KB Created: 2021-06-29 19:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5c56aae7894a94c752d8329a57c1670b SHA-1: 82f616264f6d840c3bcb2062f56273b373ea5cba SHA-256: 543ab082d70ac313d9e3d38e6d935c279cb1c20d8dc2bd0c42cdb47fff6214a0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains multiple links pointing to compromised WordPress sites and SEO redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristics point towards an attack pattern involving user redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8003

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://queure.ru/uplcv?utm_term=would+be+welcomed PDF link annotation
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a8a15770---gimidexoguzirojovexefog.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/7296fc1db85b994388050729e310ee0b/wizuvaloditavu.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/vopokutiwolodeju.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/98f877e2f2c00b63db01801bb469cf33/fewaroli.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/j9n287acsgcn2p2ggh069hriqt/81516861539.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/26nbh77bdvdmler0ifb1158e16/biropimafopixeba.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/suminubuzikafokagim.pdfIn PDF document text
    • https://ka-base.no/images_content/file/48540869409.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/51253859900.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8hu4chgd402h67k1vc9lcih543/fidumuwekaxanopunote.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781c61d47e9---21366268316.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/78a44cb413203c456177b10661cd8a93/jekena.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/41383292871.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/50705430255.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e532665ccec0534fdfbbe9e85b055095/9331283130.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4nkc2as96dkohrlu4i8trkgk10/45048565278.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7b3dd8b1f8f3787cf1e43b77287941de/gegomufuxibojasasupegeja.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/b45e9a6712fa422a535fc7667f4c1e14/tegajivav.pdfIn PDF document text
    • https://atl-50.com/files/file/seveziwuvomepilaz.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/lowepisujojizifilerajaru.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b27d75bfcbd---dopaf.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/nipl4ahdoc9at9hkd7gbpmn8sd/33913990268.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa3b8de51---16660862101.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FA 18488 bytes
SHA-256: a36fecf5c59cf6a75f125b504b6420cc41497e5c2112d92a0ee90fd6f1e05bae
font_01_sfnt_off00015524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15524 220556 bytes
SHA-256: 77cc540b58597e0a12bbbe77276913db1771abc9fed6db2db9ed8d04b1363a05
font_02_sfnt_off00036bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36BC0 28152 bytes
SHA-256: 10f51fa7100440b0291c9145b25c288e2488ba3c0c811cf3fbb562a0e9d28728
font_03_sfnt_off0003929f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3929F 10128 bytes
SHA-256: 9ee61ba2eb90961345ff6cbedc7609454a030b3abdef7c1177453c31897a3330
font_04_sfnt_off0003a945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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