Malicious PDF — malware analysis report

Static analysis result for SHA-256 01011e6825326f14…

MALICIOUS

PDF

84.3 KB Created: 2021-07-10 13:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88593e524f4d2c5d96791b9356aa150f SHA-1: 89bd187ed854eecb99d8e5143c1832b70e1d95d0 SHA-256: 01011e6825326f144bf4e10d2ff216176b579c913c185b7f2387c9e11b755184
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains an embedded JavaScript stream and numerous URLs pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace15746c34---xotabetum.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093391f39824---54480813194.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/b2bb69bc752f8bf0d10baf263e4a16c6/jevolula.pdf
    • http://refpecsbelvaros.hu/kepek/files/428863524.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160966635dd8aa---vipuwuvawuguxiteg.pdf
    • http://rowanfamilyreunion.com/clients/28915/File/nadewilaxexev.pdf
    • https://batikatravels.com/userfiles/file/57459026554.pdf
    • http://danangsculpture.com/uploads/image/files/78022600823.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/16ec0a2ea6b21dbe53ddbc5560050be5/dowemexobamezubovamuruwa.pdf
    • http://ketoanaca.com/uploads/image/files/1286957474.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/albuhhksm8le0kqn46dsfk1078/87641391872.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0irqllt00ec4ooksmgi232s647/fiwikipezibubekane.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8ce88b51---14587054581.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8d2937d9629b24e87d72f1aa372bdda9/40905764676.pdf
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/68492168197.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/f967731bed66d0db44979d74819de80f/31118186980.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/6df8a4ac761eb38b3be0e06afcf7ad0c/rejogelomefikubatatado.pdf
    • http://bronia.org/userfiles/file/busuvixiwe.pdf
    • http://ailizia.com/userfiles/xodebilirejebixubolugopa.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081986c69530---tonavidajutami.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a292a4e7a55ca08411d32bfca14deede/jurosumuwowiz.pdf
    • http://musorcentrum.hu/files/article/file/63975548376.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b0ef3cf1a---94720877982.pdf
    • http://plusk-car.com/js/upload/files/32690846187.pdf
    • http://lenosada.sk/editor_uploads/files/39833116707.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=kitchen+table+in+spanish
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea83.bin
2c588283dcce4252f9262a8a22d14b776ce17e5f7a724b8f9a455ae1df75d2d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 16372 bytes
font_01_sfnt_off000114ae.bin
b71cbeaf224cde331328e85126299ed0d538d724570b3b54fa210cdf0cc4cccb
pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 10384 bytes
font_02_sfnt_off00012bdb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDB 16792 bytes