Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a0632fb32188d0…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 06:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a791726c4452ce368ec25e5df225c4c SHA-1: c47b1f2e4d284f9b0fc76ba142c73cb75de6f108 SHA-256: 40a0632fb32188d0ccb41c5bad9ac270526824be31982ea28067f9c7cbeff058
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised infrastructure suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/j9gmfn30ck9sjreqtgr5jnfd12/5836011675.pdf In PDF document text
    • http://form4concrete.ru/pics/cont//file/63498472554.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/zubajevabelimitapuzodonin.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/boximomubamuzekirakidulax.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/43nj6nvdvjirce8hshe3ea1tne/370957196.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c427446122---damogawonupoveja.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/93093890680.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210515/file/16210916843254.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/38003652808.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210528132411.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/sarukaxarejisune.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/lokarepusolobutotebi.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842cd5d921---kuvepejimapeji.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/of0d4jpti0ng7ac8n0gr9e6cjc/dojovasuwirivufufifawez.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d98a807fb04---80542093096.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3c26b0e60---fowiwunawafomowarizorilu.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/gajosunulezudoguvowi.pdfIn PDF document text
    • http://nktrading.qa/file/files/garojase.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609eea2939e07---ledumodopikosefedural.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d509acce71---1408435118.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/4578064484.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/80439766982.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/32373210650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=el+manuscrito+del+purgatorio+pdfPDF 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_off0000c8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B0 11044 bytes
SHA-256: 6186b53007acacb6bdfd294c373e0fd84c2a446e2df1892d74246959a9418391
font_01_sfnt_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 19124 bytes
SHA-256: d37ff748e2861e2306032eb0bcc4044cb5ae9ef612ef263d167f109732b73428

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