Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f9aee949686d97…

MALICIOUS

PDF

93.2 KB Created: 2021-07-17 08:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b72ca6885b9d6f5f3a4c545f19d5a33f SHA-1: 7d83c1228ea6487c9fd25a72c76d12b7505bbf64 SHA-256: 12f9aee949686d97aa1770f9948dee7d9471c68eccbb4e0d8ae7273fb38bb177
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites hosting PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of numerous links on potentially disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/a9b5aacff73abc833c59e30ae6571edf/4818028354.pdf In PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2dfda2f1---54393371198.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ce3feca1beb26968c2d4e3133e459e71/dirugodusob.pdfIn PDF document text
    • https://laser123.com/geektic/files/25802503897.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hbfnipat6kc52103k29e3fhn06/lokinabinafaxataxerimigel.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/95753403688.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/vaniduvilobej.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743f357d4fc---7168669913.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4dba941c---gomumimusetinewododunus.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/movadepijovef.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4f1d827c---92348551537.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/la80g1pchc74145oct7u4b6gu5/2620171712.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/81765690323.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa7b31253f---28834504218.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2462a0a74d---xapedanumaribevefosuvesas.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091376b63b81---39878031180.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/vqt0vu3spd7r36mrf0pvcp3tk6/bixumurudaf.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5953f3713---44498297074.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160902d3f3e7a9---sejivit.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/20a534cca4385a63604163200f022407/5585707137.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/hmc6pba1ei10soaomjp9vtqnt3/tetofono.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210526182713.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4cbdd8735---zafobedakutogunekemo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a14asbhls2hlb5sl8e826oak5o/26115949402.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608261912e758---35627295894.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160759c80d735d---xudofafawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=budgetary+process+in+india+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 11016 bytes
SHA-256: d715c49446bfc72f686b6972b7b8a142d184af703beb01919f3f431ac48e49e8
font_01_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 16848 bytes
SHA-256: 63e85213032c88eb7e57912e51ff5098654a341999ef8a605196d0671fc38b1e
font_02_sfnt_off00013995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000151a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A6 16120 bytes
SHA-256: 5cfa37fce0989fcd98349beccf9a63719aff29e66b00f3ba655f54b68a91f5d5