Malicious PDF — malware analysis report

Static analysis result for SHA-256 054f1336a5646771…

MALICIOUS

PDF

85.1 KB Created: 2021-08-16 00:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e5546962af39c3ef5b0cdd55bf33987 SHA-1: e3d3777f3aec42cf8602968e62232a8f117de6ce SHA-256: 054f1336a564677171822edfb540523f77aa94e901843ba3e50ec257e498fbae
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV both flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or to distribute further malware. The embedded URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://studioscoponi.eu/userfiles/files/lumalupiruxoreg.pdf In PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b808702543e---mewofelojumakodikigaxa.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/u22mcgrno12epfjjjo9k0jnedt/44773016651.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/30f522d878604b51048f0e1769b5ae5f/2612430406.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8df56eb3a---19456858002.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfed4163977---12076553574.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160820b1a2e488---siwasobod.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/kinebovozap.pdfIn PDF document text
    • https://cristalensi.com/public/File/97128929786.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/forokap.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5ea98261a---rinepokepunazutimevogupo.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/modevozalatixen.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/17378124358.pdfIn PDF document text
    • https://eternalbliss.net/file/zedurijexuju.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/mimimukesadekiv.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/19707692458.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/3bbd08880a6dbbc6be262274b1ebc092/dogefejeponuvenova.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0c314d158859b725ca8008229346aa2c/58977576187.pdfIn PDF document text
    • https://afayl.com/userfiles/file/voranamulajusepajuduxo.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/2647349069.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a6fe46ed4f596a6e2d88521bf9ac945c/mugelikimofixozedojo.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/vojowotudivinafuxukixiv.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/saxijuzelugaturibelis.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/zubaderexubanesa.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/be35512b31eb804c67d23f3ebbfa7187/77671778080.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/returopanalamuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+tell+if+diesel+injector+pump+is+badPDF 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_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 11228 bytes
SHA-256: 9b2d8d7e03d72b99a0dc989fcb26210ee9c44474ea321e29a297224e03acfbfd
font_01_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 16208 bytes
SHA-256: ec7f54693508734aa79adb32994ecf8de33e6695f75dc339d4d049443a69097c

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