Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2ea00531d10d5c…

MALICIOUS

PDF

91.8 KB Created: 2021-08-28 13:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a257aa0dfc985bb8a80d2a35de249804 SHA-1: fca000cc279b094eaf2e1859b11b20530ca99304 SHA-256: ff2ea00531d10d5ce6b16da2070978fd8a7454bac74810be0e0aec61d384547b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://studioagronomoserragiotto.eu/userfiles/files/vasixerulep.pdf In PDF document text
    • http://czapla-dachy.pl/public/images/fck/file/laxarexutezabedupozafi.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/tiserer.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/7op2e3tcb6u3okp8ll9rkd7psr/dumisemumesimotejigixu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c1c24d29d8c---28864041462.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/mikavuwudi.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdcb0bb70f---xuzedom.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f3c94cd30114fc8cff1b60b447566389/14880448335.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/pakegaxefawuw.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/50158a0654538ed5b8df8370afa5bdaa/kekapor.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/36276718527.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/54838190058.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/dakopevelekowowifavotola.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/92523585689.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/dfbf8e49ded79349c190ef6d43596ebe/pesutilefimojufuvob.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/ruwim.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087787d44923---72451132358.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726cc01cc7f---75972134519.pdfIn PDF document text
    • http://newmob.it/userfiles/files/nuxikexe.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d83145e1c---luzon.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/tufabixor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=4+hour+rule+blood+transfusionPDF 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_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001168d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168D 18808 bytes
SHA-256: 164e37fc175f16cfa2c10492fadde81def3bc046aaf7f4a969c8ac6d1104179d
font_02_sfnt_off00014826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14826 10672 bytes
SHA-256: 70f95ee684a3a0852529a3b987e0e0b4f1c4837cf1545e3d3c6d969bc0328979

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