Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4457509f2b79bd1…

MALICIOUS

PDF

100.4 KB Created: 2021-08-08 23:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6f475b5e921f904fd8337e80a14126fa SHA-1: fd488557dd2360da0e1da705c92cd64507c06dea SHA-256: a4457509f2b79bd1f725520db83d78165172bb7aba2eefb56f8a2e09bb920a07
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external URLs, many of which are hosted on compromised WordPress sites or disposable domains. These links are designed to trick users into downloading files, likely as part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 8

  • 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.
  • 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://philabc.ru/uplcv?utm_term=clash+of+clans+app+download+hack PDF link annotation
    • http://banquat.com/userfiles/files/58322798609.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/57274194544.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/lezawamopitorakew.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086686097de0---finelipidovamerulus.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098da35d9576---rawolu.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/27402061549.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210630055043_NzI4MDYzMzQyMDU=.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af9dbb1d5e0---70208141819.pdfIn PDF document text
    • http://www.asslar.de/downloads/kunonasa.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c99116a2bd3---57122485196.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/bimemivitezerolodipun.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160804478b9019---tutedavejawos.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160babaaabfcaf---87071836021.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210629_E58245E7583C9563.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/71479767298.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0daf814cd---25679894121.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/nikipevi.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/98554541015.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee932f6b382---68413090727.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf88ebeb51f---74372491296.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/52358500257.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/tuwekiweviru.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/lukanopumiraj.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88b22df10---42637935358.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/xosobuximurowifubesivada.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/sukixadiluvigaxi.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/41486579566.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_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3A 10504 bytes
SHA-256: d47eacff867c84b07fc00b33b5bfea8a38672ce66b59b337a75b39bef3b5140e
font_02_sfnt_off00015220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15220 18212 bytes
SHA-256: 44273ef965cf69d9bad3508b309aaf124976bca1ce53bad0df086616e3e88ced

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