Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48114bba530d2bb…

MALICIOUS

PDF

87.9 KB Created: 2021-09-14 11:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6cfb5a054a6f5ae3c68dfb6b1445f1d4 SHA-1: 9dc8a18ea59f88b06d51672a94ecbb5ae19991ba SHA-256: a48114bba530d2bb73275ee9778a435557b5344a60ef1367e57f29d2e7b64153
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malicious content or providing sensitive information. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c976d8ac55---32971090733.pdf In PDF document text
    • https://endeligmandag.no/e-brev/data/div/mafejozelivolamijovu.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/78963768455.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136da14073b4---biwarolimaxixusasuk.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd83eeef9---kibedinovop.pdfIn PDF document text
    • https://europartner2.pl/uploads/52039547347.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/55972647835.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ca43e0a058fd006d29290f47caaae7bc/70394740115.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/67708846292.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/xeboj.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/tetavepefinu.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/99258845300.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/38049894500.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/48891464228.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/73723650851.pdfIn PDF document text
    • https://jss-moms.si/upload/File/58100442073.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/punudupisugofowu.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/ruzexenomarapegimutofik.pdfIn PDF document text
    • https://emenu.hu/editor_up/48828287880.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/vuvoliparozewiv.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/64488667028.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/61843109023.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/rigozurebu.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/zorek.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/bidepebupas.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/lirepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=root+toolkit+apk+samsung+galaxy+a41PDF 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_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 10944 bytes
SHA-256: 0865eaeb34e2c5513517c9abbdfc27b93814237cfb133c7cb45cbbd61fb92a94
font_02_sfnt_off00012144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 18448 bytes
SHA-256: d6e570bd3d1edead302b14897d1c14d6869bea457e774ca0a7bb0216184dd830

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