Malicious PDF — malware analysis report

Static analysis result for SHA-256 82034c4105796616…

MALICIOUS

PDF

90.3 KB Created: 2021-08-07 21:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a32a2bf8bf548139d5e51b6d49ca1146 SHA-1: ad5b550d8ff315b0f5a599974a3e37e85d506b70 SHA-256: 82034c4105796616bb1854de6a9033e071b100ba9b53ab9d1987b480bc6a424c
176 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it contains exploit code. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The malformed stream length heuristic further supports the presence of malicious content within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0866ae579---54410893696.pdf In PDF document text
    • http://teleinwestor.com/userfiles/file/31953231352.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/lomijewelupef.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c706504b403---52535879417.pdfIn PDF document text
    • http://spiregene.com/image/files/20210717_161244.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/85219540040.pdfIn PDF document text
    • http://retailcop.ca/files/97020608554.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/cf379eebd55f644e8e9efb2222258fe9/1722744267.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f1dafc5666548c0e775cb72cb048e16b/toxomub.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a08d25a8fdd---vakofuruwenirefutamepux.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/5158128120.pdfIn PDF document text
    • http://specimport.by/files/files/50141559121.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021080703311074.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074fdd982476---zusejuzopafavezalum.pdfIn PDF document text
    • http://soupworld.de/upload/file/rimufivibuz.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/25076427655.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea62bebfea---21461582416.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/mazasex.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/s0apiorvdh0hfkqd42h40b1b11/bavanetetejorikufu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3d57fd044ca322f256c35c610de98d7b/97508293532.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/wemovotukinitabaka.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907655c127c---61737446852.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/fb0d383c6958896bdca346dbb6e37932/70167051667.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/ab00b38a08bbfffacc2c2b577dc098b1/filepunemiluresut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=que+es+la+direccion+del+proceso+administrativoPDF 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_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 17016 bytes
SHA-256: d4a77733f80a52c0ef41643ead280a0d92b5f0f4ec11f4dc288f041cdddf109a
font_01_sfnt_off000126de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF5 10900 bytes
SHA-256: f5696a884bac47d51d29ff4a4d7f64a6727cc493cd9bd34eea8b71aea3082c92

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