Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ca3bc3c9c1e111…

MALICIOUS

PDF

92.3 KB Created: 2021-09-06 09:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56149bfe5faf400eb719e293dc2d4f96 SHA-1: 4ccc952789197b8e2eb544fec337aa02ef7d2e40 SHA-256: 95ca3bc3c9c1e111435c49e36054e9b47439028611dff7afaffc461926933a72
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on domains flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised WordPress upload directories suggests a tactic to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://fonnepal.org/userfiles/file/51441357495.pdf In PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/zisopifodetepinitigasamu.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/1016406897.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/682c33e606e4af3a64c89ba0c7ca3457/35125597041.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/99816932716.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/24945163246.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/tozizasemiwuro.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16100f78a30877---10855651259.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/sugorijagofo.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3aa181726f88ac10e32ddf91244f8af7/42644914102.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/sojisamujapesiraruwosi.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210728163110_eht5ln.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b7585ba577e---2632787192.pdfPDF link annotation
    • http://okfilm.kr/userData/board/file/22039751127.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/25987539006.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/65862379482.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/56985874647.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba69da33126---27180070720.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/79d252a501f620da691e8059d58b212f/83632799446.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/6qeg5e53650l75aa7rrtck741k/18593429330.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f1b79255e315142f19091cd9c9d724b9/xavemafa.pdfIn PDF document text
    • http://lovesenergy.com/file/58287765083.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/fuzotinirimikiramabuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=famous+horror+short+stories+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_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 10692 bytes
SHA-256: 65e0bbe25d25f075f63e3a7b48a9744197ce96ad91847935e5760b349b70ce1d
font_01_sfnt_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 17868 bytes
SHA-256: 2a9b33ff3c0f025c71a4cb2dc2265ba973c45d6ea8d1976170623e4b8b6e0107
font_02_sfnt_off00014b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1