Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec44e4d29c7a991…

MALICIOUS

PDF

91.5 KB Created: 2021-06-27 14:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f3349c97178d56ba1166e2ce4b04ef2 SHA-1: 7984303bbdc3ca3c40687d1f953bb1cfb6015f6e SHA-256: 3ec44e4d29c7a991c04d55e3e4d0036227f53346334c4bc20eddc9995b55586e
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or exploitation. No scripts were extracted, but the structure and URL analysis point to a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://jtour.vn/userfiles/file/14521903551.pdf In PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ff1db77c6495fec04933c717ea1b3c3/gotifipesafibumuxoniladef.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e063f5238951e2d8da435e88fdf8275b/96321427970.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/97035892404.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/tirufafuvi.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/596ccc51f349e15ffb8d9014868eb9bc/46549819190.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/jusowafidelenaxasi.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/83489906189.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b6eb4d4a947---sejebimate.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/vomapokobozibejudufunobul.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/13362496646.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/zixogotojurodibo.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/nukezexovotisemeborebo.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca62215bcf---reguzot.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16079163fa33de---tatunupojukesepogox.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/jiruguv.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/edd7oq0olap9tdp5bmjd08f70t/padufiv.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/aba80c9a81d9035d6c61808fe124f0c4/goruxifotapew.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/96f5bab38f9d5e6ee4128fa8652e598b/guribopepimamuvijotodiv.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vawapadonobusomexa.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082246e6b276---mewixu.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/7361378008.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5613b531d---meripa.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a51353577---68505119425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sing+praises+to+the+lord+scripturePDF 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_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 10968 bytes
SHA-256: b134a62ba0ef39830e66cac891cc62fef5f19a0752cbffaca48d8e77a81a6e6d
font_02_sfnt_off00013347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13347 17352 bytes
SHA-256: 4e96e9b346279a6599991817f0384e19b3a61940740526f422053178a3cca34e

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