Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cb4c3c21ca9836…

MALICIOUS

PDF

73.5 KB Created: 2021-09-07 17:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8e1e210556a1498b74071c16c60412f SHA-1: 7bb937ee879ee9e8893aa42d8fe7add0b8652e00 SHA-256: a8cb4c3c21ca9836afb98a3ce51630af3dbc4efa3ef5a75d26949ff5f25cbb1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm intended to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b321e34a7b793b0810289781ee269fde/febakutamebomi.pdf In PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ef7f40ca86cfccd2143ad40333cc92ec/binaxowugalebedisiguropo.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad1ddabe50---82113738452.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a44ff128e7f---tixuzukemas.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/16313864393.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c404bdccda---mamedig.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/mokofofulotavefo.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93cf0c55a3---lisoto.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/39631382839.pdfIn PDF document text
    • https://parkettworld.com/upload/files/mewazuzisovaposurev.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/8722266112.pdfIn PDF document text
    • http://ranchobg.com/img/file/53355536461.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/74638470800.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/nelilukibewevixenigen.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/vizegoruralexeporofobu.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/21513344137.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/dezegajomi.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/47384367737.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/87475008764.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/80721164886.pdfIn PDF document text
    • http://freetds.net/userfiles/file/40912176547.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/11893cd47560bb6cc0f05f3e18a4d5bd/zizesivalavanuzajuri.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/94346767929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=long+division+of+polynomials+by+trinomials+worksheetPDF 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_off0000ba53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA53 11400 bytes
SHA-256: 082eec43fab8f7056f9d6a850d4e63558c865fad950b8b7839359e09dd5f6636
font_01_sfnt_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 17284 bytes
SHA-256: 7932ed92a176432f5d94e8ae1662885fc1891239484f7918aa9635e8d3847445

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