Malicious PDF — malware analysis report

Static analysis result for SHA-256 d915200aa86d0b07…

MALICIOUS

PDF

85.9 KB Created: 2021-07-25 09:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8381e4c7e5b10bb63ead7c19e26e9839 SHA-1: 2b82227aaae85174299bbac5a5b5d9f79143c0d7 SHA-256: d915200aa86d0b071bdfda3a6439586196b086a400ab702b09a402f09d2d5444
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 or disposable hosting, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://jdhs77.com/clients/58520/File/30329594477.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/82857695075a8097b2ef8b5f9b437265/8334546324.pdf
    • http://www.allatpatikapecs.hu/images/file/23114653282.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072dcb703730---tikezizazexewofinide.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/64773435858.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1d562c5e---gusipewusuzases.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608139c76b2a4---33266641722.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/879h4s32vp4v5e94ptimu8rjsp/32846823194.pdf
    • http://ahkjt.com/upfile/file/marujok.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608543927f5ef---46848944672.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lowokis.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/p30o77qcblvfgor47li2hr2fj7/bigisovuwurozuvu.pdf
    • http://iziusb.com/userfiles//file/12496600464.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e2260f4d6---51768689866.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e3d5c6de6---tasabevitivibijasa.pdf
    • http://elementsgogreen.com/userfiles/file/mejotesalumixexiw.pdf
    • http://inglewood1968.com/clients/68690/File/16362783248.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef87ac4280---50812108136.pdf
    • http://amadpich.com/userfiles/file/rewaxibuzimuboga.pdf
    • http://asupuro.com/user_data/image//file/67470672869.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aef11ee099e---nibevepaxenowutobobasuj.pdf
    • https://menuiserie-sainte-anne.fr/userfiles/file/varanaxiwixaxekulogugumu.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/891fae5a0d709d1bc889a330bb42cd38/50743732582.pdf
    • https://marljivo.hr/userfiles/file/vuguxujaleroxasib.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c684b445c---zakotojukawegutoputor.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+mega+emerald+xy+gba+rom+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d138.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD138 16140 bytes
font_01_sfnt_off0000e6b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B4 16792 bytes
font_02_sfnt_off0000fec6.bin
ff992bdc52a3262c48b942976cd9701f103fab91653f4fcf6bdc986a991a762b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 18572 bytes
font_03_sfnt_off00012d8c.bin
2bddeda7a4b26c83a90dbb018ff9b7cf808e0b8b78d791819690c3fe494c6f6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8C 10768 bytes