Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5de14b085fa8967…

MALICIOUS

PDF

89.9 KB Created: 2021-06-26 11:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fdfe97719584a6cdc6c368d4eaaa0766 SHA-1: 4bf394b958e8786913f41e04d45f3cc543eb9747 SHA-256: b5de14b085fa89676ed6329cac37f6d54c8f951f1b64613a75d03884ff525da6
116 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 compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious content. The ML classifier strongly indicates maliciousness, and the presence of a raw IP address in a URI further supports this. No scripts were extracted, but the overall structure points to a downloader or redirector for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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://beerskiboot.de/img/upload/file/xewafojujuxobawanufe.pdf In PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609612b6843d8---lixuxi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087318c13ceb---dafode.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/83909726716.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/vs5lftfi9mrk7n61ecuopesq87/24781825905.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705df4a1487---33780157651.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fad00f5ae---detubo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c338dd18441---77337609436.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/91589781729.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/cbq03bdl0cndou15ri7tnuqgn4/13150477251.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a22a3c7403---44959276861.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/7sdbu0cidgjr23m2r5l42ro305/88221334950.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/63272827226.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608753318f6ea---60666564891.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d13403829---85724158490.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160910bc49d475---74010906420.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/19373757612.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0897a967b---futovisurojorozi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2083378f392996c8ee6e59f468bc3364/32542463100.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608066fc304b6---zofidumesefawekipowizezo.pdfPDF link annotation
    • http://meruzhankhachatryan.com/app/webroot/files/file/43398930767.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/9913285451.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/bozojeja.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099aaabb9eb7---lolibonojaj.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd9i69mve03durangd20fjf2q9/mukusamopuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=accounting+for+ipo+costs+us+gaapPDF 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_off0000ff0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 16584 bytes
SHA-256: aa3715dc082f6eaaf6a881cc93c5b5ad418b70697efa89b4703acf1f9fb98e93
font_01_sfnt_off00012a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A18 10556 bytes
SHA-256: 23be322602d22ec48a165ed6d14d256c7bb05ed2241a4b134088929e19de66a5
font_02_sfnt_off0001425b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1