Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b05fcca8e1b5be8…

MALICIOUS

PDF

72.5 KB Created: 2021-09-08 04:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1e80b211b64fb72219f69be407c8f78 SHA-1: 1c4c77b83d7176362cc7e1eaae6f6d5afeb62267 SHA-256: 2b05fcca8e1b5be88fada6eda1f3306463a212cdcd0eb558e13e297f1bf6a9a0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings supports this, suggesting an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://santeh.md/img/files/wudox.pdf In PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/pujavaxep.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/gapunuwun.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/rifilimisitumix.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/mibozimetosidubox.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/39069128370.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/gakiwijakizurekuwe.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/vdgsbj5pes34tq9s9oi5egenm5/78234619014.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/xiligajenavubidofikive.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/48256220159.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/23300604970.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///fegivuniwubikapedimuj.pdfIn PDF document text
    • https://schmitz.cz/res/file/nofemap.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///6034544939.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/81375722300.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f8d86e2db---58519769427.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/503fcfc8f4ec426f8206c83ccf5e5730/49406608220.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/xemisekikeduzeziviwove.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/22e5a62cc5d48e4e188f8fb6e9465e94/vuzufise.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1611403aa4bf32---bavorozebiginib.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c98b95093---tebaxiwizakeza.pdfIn PDF document text
    • http://focostrade.com/files/20210612085013.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3b30b4dd---palififevutak.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/pofunavutu.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/41882475920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=palmgren+drill+press+manualPDF 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_off0000bbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD415 10616 bytes
SHA-256: 6cc9ab25d57ffc958775c79a291a87e39001b50e60745f9c2a25ca3f28a0b125
font_02_sfnt_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 16128 bytes
SHA-256: b5ce119a3a77a684e2fb0cf451ea20ba4d26d37db84664d91ca31c6e5aaa84ce

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