Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe2a4a1a4d62e1b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 22:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13d904807744e77f2c7880284220cd6a SHA-1: 7141dff580a67134d0ca12b44ff8b8f61d23fed7 SHA-256: afe2a4a1a4d62e1bf6a702577794564272fb375820bbe2a1a9aafef8acff50fa
224 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=how+to+transfer+files+from+phone+to+laptop+without+usb PDF link annotation
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613afea00d72e---desoxelud.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/sijokorofegijatitu.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/49127046302.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/dogolafatop.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/jorexurepefotezor.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/sufuvelesegaka.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/rotojulemosisezo.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b567e86189---zoxopefizenaro.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc34dbe02---72742547221.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/10090670747.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/75287837451.pdfIn PDF document text
    • https://polytex.de/sites/default/files/29347247317.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/13580426685.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/12736797275.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/52828810018.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/20795309524.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/81396942196.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/19163388118.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-2/20210902093128496131.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/lasawopinatamafopufem.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/xagederedodisida.pdfIn PDF document text
    • https://taperagi.com/contents/files/93904550893.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/93025683976.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130d73a2b498---18122654846.pdfIn PDF document text
    • 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_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 19324 bytes
SHA-256: 8bcaafbd446abf63aaf2cca2110ff285bcbe68bdf627819c4478cb54c08a8916
font_01_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDB 10940 bytes
SHA-256: 8ad694f29a1e63c0b1020eebfea271939e40f1243bd6afdc1e4a9accca10ac76

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