Malicious PDF — malware analysis report

Static analysis result for SHA-256 136ceeb5a09412c4…

MALICIOUS

PDF

89.6 KB Created: 2021-07-07 18:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 482461c0bf5f0e1fabc7b3b935d08dcf SHA-1: 77c924d10dfd70b0ac2510dd5b09efdeb944f1e7 SHA-256: 136ceeb5a09412c4de4d97416e30145a2a3d9650fbe89de58f2385b8b1017a4f
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload directories, indicating an attempt to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple links on disposable or compromised hosting reinforces the malicious intent. The document's structure and content suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39125f978---mujulawavilumotero.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2994642feee0bae67fbc39cf9a87fbef/ribexirumarixilo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879f8c691b2---texiteguwo.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c221c84754561e78e8f478fae415594c/95094342158.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/24246d25f864028b3a7075a6d6119a68/vinovejamurarajovipaxor.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/44f21dc41d3f6244c0788c04a91333d8/9383856681.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/41624013168.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b2d3b9f6241a156b3f8871e135c63468/kigitemo.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/c7be2033bc791b789da45aeecf079e6a/16717574528.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/batul.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/wefavev.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/68774109629.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cd41acff9---fufunadip.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e0c70e47---mosevimi.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8df51e9af---mazizikoripugatorokada.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882e7534ae9---vepenemirox.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4f396097b---96017206947.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/83524087117.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc3d9abe1a---14142732927.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/cfee0f43d03a53387926b3aa5e565a10/mogunegorifaroxekiw.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/lasarutivedukas.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/dabutufagusamiwizevo.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/adc0ed69028bd63c5ca58c5c376d2204/genunedodele.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/14853687139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=train+your+brain+60+days+to+a+better+brain+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_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 17920 bytes
SHA-256: eee1a9a7e211bab16cd9f1aa64631cb40668de3dc22fabb6763630b5fa51c307
font_02_sfnt_off00013ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE5 11052 bytes
SHA-256: 553223d7baf2696ebf6661842ba5e4a6ba5a4123493ea6f35b62f7e9a17a771d

Open this report in the interactive analyzer, or submit your own file for analysis.