Malicious PDF — malware analysis report

Static analysis result for SHA-256 a582d87a168244a4…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 04:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db5c17e6d97af5df03600c59ad56d8fc SHA-1: 3f91d5f783c28573a60f3399d953c4b7efb6b9b5 SHA-256: a582d87a168244a4a5dcfe748d62cf024d52eed51676bda563c894c155ca5cc8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs clearly show a link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/326df8862837f42b3b516d09761b505b/jutidibawekeliwi.pdf In PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/cec981bb440dd6450a1e3e5b4528e4eb/wadatodigajajimabete.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/petuwegexegekuga.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0b590adebd943df060fe6dafd971521d/mifudonenafuv.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/rulezimirujivajodalubul.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16114e31a86057---kovapidigezeja.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/76752991185.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce58841ff---bosogogefarivedamosisekaj.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b6021eeacd5---80395175993.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec63704cac---zosoluri.pdfIn PDF document text
    • https://seerupit.dk/assens/file/96602674290.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/obrf3psm9ddollpdu4qv6n42ph/kuwosexofuratome.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/nemoxezuxituxifekuxo.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/vekew.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/siganuriwuwofowogugoxil.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/tutaxelovixesif.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///13302351895.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/33541486373.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/93315071811.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/48463237001.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1b7ff6f228c5a8d9e9a6de11acbacea1/19400999884.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/pobodetobazadoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=star+jalsha+serial+live+todayPDF 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_off0000d7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 18964 bytes
SHA-256: bc2c27f7f05bb8e333638c15d39971e31a4c04a1ff82b545661f369db0154336
font_01_sfnt_off00010844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 10628 bytes
SHA-256: 20ef7db4483e5443ea4101e60cafcb5aefc58535b99cfc724ca58c5a9d4265b2
font_02_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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