Malicious PDF — malware analysis report

Static analysis result for SHA-256 7056c63310a17620…

MALICIOUS

PDF

94.2 KB Created: 2021-09-03 00:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8512bda0e86fdbe4ea3197a5c42b72d4 SHA-1: d979bb154fe970f083b1f0a4ea602dee694ee3a8 SHA-256: 7056c63310a176203e3d7415e0558c0da86a754d1408b365ad6e5bb6ff9702cd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters in some URLs suggest an effort to obscure the final destination and track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jknqccpcisns77286v5elj6vl0/tipoxakefovuvomomizo.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/js0ch9g5khldk19ise6393saq3/motozag.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609781a7072bb---63533130012.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56c0567c0---1172648054.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/45031368626.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b33e5a2ee0d---boxunawa.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/jumeb.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/92899921948.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/81825295466.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/35210761049.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/09f25abace14f76f6929653d41edf2c0/42382520406.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/dajivubarogukuxun.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/88771338155.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/7aea8e7c57facf5e69db32f455724489/6865935299.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b1804b3c5---53651016422.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/8fd4df011154a4bd59ed5a0d5d07461a/47258623846.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ad2dca988---wagobexabox.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5bd314d5---bumajurolilugolajun.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/shj0samhideb6js2oirkmmb9gh/71042034534.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/83044419881.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/ketusezaranopiwobitunosu.pdfIn PDF document text
    • https://webmenuplus.com/images/file/60423641545.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/9qqqp1jaephsh8d0mg43v8o6i3/vojubebofivopagaruzexa.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210731060533154.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce778dab5ca---gadefuguvubenatejus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=senaryo+nas%C4%B1l+yaz%C4%B1l%C4%B1r+pdfPDF 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_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 10596 bytes
SHA-256: d5c0da2102b9d294bb723904a713007b54001e9f801cabc73763d3e256b52096
font_01_sfnt_off00012371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12371 18876 bytes
SHA-256: 33a941f0432b0dcd76fd1347d47d5d38bf7c73d8ceb285b1dff7de5ce0b510de
font_02_sfnt_off000150ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1