Malicious PDF — malware analysis report

Static analysis result for SHA-256 9628ad5077eb3eee…

MALICIOUS

PDF

84.7 KB Created: 2021-09-10 16:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d68bff9c54b40790e13b877f7863759b SHA-1: 6028b931734b39aed6f60eef63047601b8129e46 SHA-256: 9628ad5077eb3eee15a657aac2ca0e267e621b7b52ebf97babc0a9246d1e7a6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161320b29cf1b0---16066762887.pdf In PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/javexukukasasolikipoxob.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/gasuguwesaxoguxekevewixa.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/koxaxozi.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/73940137970.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/54223984300.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161307dd241b07---84576808686.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130700569ddf---31882912405.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/novutalevogekinerasev.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/tisujuluwawe.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/90936cdfd1f1197b646079088bab8125/60558246020.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/39187027017.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/72770006027.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/nkqast1ds582os4ht7p1tadht7/86216237005.pdfIn PDF document text
    • https://eniedu.com/data/file/20210903065317.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210901200118.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109071925028080.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8ef059bd5b20708852b9cd5bb373d08b/61721763835.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/54135223521.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/5555503689.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210910053625_fogwlh.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a49e5baf32---fejevukurevejonup.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/vorelobo.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/dimukegalotopiwafur.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/ludixer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=stative+and+dynamic+verbs+exercises+pdf+with+answersPDF 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_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 18264 bytes
SHA-256: 7f79c77a6aedf317194d63b59c95e2b23f4011cc5b406a650a63162aa1bf39ba
font_01_sfnt_off0001126c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 11300 bytes
SHA-256: 38e76a2a6679b7228d7721eb25a20ba0bbe8a01a0f58c2980cb4ed9e3edd6512
font_02_sfnt_off00012ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1