Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b1066d9e1e6439…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 13:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a8a4b39730af231a7d412b600e323aa0 SHA-1: 0abfe0cce168cf39a963738a074ca9d224f150c1 SHA-256: 70b1066d9e1e6439f8d4ba25a35ecf9e3e23612daa6ca9b8a47ad950d1175892
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or are hosted on disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically identifying it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 7

  • 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.
  • 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 https://wildnaturetravel.com/File/8963297643.pdf In PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/daa36ca751f2767d93400a1621cc1dfd/vovaxomeraxivowojimes.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324e9b72a12---zurugojofubunidisulumek.pdfIn PDF document text
    • https://rotitelor.com/contents/files/wagepefevaresitazar.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/10020324816.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/vowejelijuruzurepas.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/ninozakelowove.pdfIn PDF document text
    • http://koutingchina.com/upload/files/tugogolibozuka.pdfIn PDF document text
    • http://kodemari.info/data/files/gumikupasubemapik.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/76704841272.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/wiratofofajebodutedun.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/88949441451.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/tojap.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/xegik.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161305759525af---6764915551.pdfIn PDF document text
    • http://skisun.it/userfiles/files/bigobudafivaxakepegora.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/47688379277.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8906483d9---tebotexipawepomofuxata.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/vosukavab.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/zetoxumaguvejag.pdfIn PDF document text
    • http://hla.vn/upload/files/golizezurud.pdfIn PDF document text
    • http://cjatkinson.com/userimages/94408129085.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/22364911344.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/turejozakenevujuk.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109010454453026.pdfIn PDF document text
    • http://med-os.com/user_upload/file/befuxijolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=types+of+collective+nouns+with+examplesPDF 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_off0000cbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCF 16868 bytes
SHA-256: 85c5de538d161134f8ee4cf79ddd5e4a4740290da2e4840274abe6ffd9a20936
font_01_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 11076 bytes
SHA-256: b3f5020b188034c0df7e637bf1478994f45669dce8d3423a98faf28078d74542

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