Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b5ad0bc4ebb0cf…

MALICIOUS

PDF

81.7 KB Created: 2021-06-29 15:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 29b87d927cca6110eb99de3928ca4afa SHA-1: 85881cc49703b1abc787b76d4dc0bc29ad9a1a9f SHA-256: 45b5ad0bc4ebb0cf511db48363947a0a4b7d9a131b0cbc1c33584f5481bbd596
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. The presence of numerous links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8c2415349---gatodidokanilalumamo.pdf In PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/fd08ebb9f8f29448dcf7fc7aa7d12367/godasofapavavezutegepopum.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1234022a3---lifonosatutobezu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcef3d3788---retojolepajutisuraju.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/81c2d67061b8ca17f5521b0f210eaa8f/99814204760.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/93424527683.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1eb397223---jibunogobe.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/7470372262.pdfIn PDF document text
    • http://fitviewer.biz/files/file/titusidadowu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/7vct1soaandjabhhp2lv7a6mn9/pesozudemabajidovi.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/12043969464.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/sedoximirenixa.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16085bd9f1c99a---vodexas.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/523f5fd85d60953fba3ea2fb3a01aa00/zovavivapuvorabubode.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/domofu.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c84c0776fb6---sagujezuwemovedunetewikix.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/76f604ff8df3550d82047a6be5d926ad/miketikotunotosikidewe.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27c2c26d3---19268594312.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/rosutebugovivikogome.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/93254152922.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/84586903488.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b87d7de96bf---55658467401.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/8d70f6891588598ae18ab8776fd4403e/6534790174.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/44288936039.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/tarumaxaminepux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=foods+high+in+hdl+cholesterolPDF 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_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 16896 bytes
SHA-256: 8133db43d63850259affa96a355c8abcabf0e9bc1238cc9e31197f324756b5cb
font_02_sfnt_off0001223c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223C 10464 bytes
SHA-256: e2ef7391b3cc0cd577cb98390a728b92426f274888653863f2e09e20986d4a60