Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44311a0062879eb…

MALICIOUS

PDF

85.8 KB Created: 2021-09-05 11:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f44495b4084a51583f81ccfd926748f SHA-1: 30eef611dc1b9fdaee5d91ee62677c45d8e7035d SHA-256: b44311a0062879ebf7350f89b131b57c2542eeb08718443cc1bd96309eaba91b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/4a695ce7f1c5c7b02c0a5c2066cdaf38/podiwegabopiberumu.pdf In PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/uhmdq29me01v59gog7ic6i4ns2/novutonotewaso.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/mvg8sev90cq6955k91dej8b4a2/pipegurapiforavoked.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210806134240.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/67913949883.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3b4a867bde0999690c8cddb170657f54/77115627332.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/03faa329f4503d9914afc381aab707ea/10651122666.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de400b3d0a0---retugakilenezovesal.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/junijirilinupu.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/degafurazikawo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e9a73b068b6a7a0ab7b41cebb2ca35a2/zipusawagoparejo.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/xuluzesowo.pdfIn PDF document text
    • https://amblamy.ee/upload/file/mimij.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/37ba4f3fa84096504cb08869e53f462d/48255727096.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/desitanunukaporov.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3b9a1e8fe2680595bda586d34091ed81/tenasuwu.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/ea4d97ce141f510742a5ede86e36fdeb/woxegined.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/50363807555.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bbm5kl5dse11jkanoefvqseu31/10311120232.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/3a8bd46d1bf8954739ebe562cd2ca70d/58699147765.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021071922130166418.pdfIn PDF document text
    • https://asiabiru.com/contents//files/dutezogekaravi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864c02c3ea1---9479998662.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab85ec0a837---xupivedekurixone.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/38785624319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=syndrome+williams+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_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 10836 bytes
SHA-256: 355bd37658155bb82de6c6aad65f37e110e471aae5f6318134f945f2949c301c
font_02_sfnt_off00011ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 16996 bytes
SHA-256: fb99e5050105c40b5de742a2f70b71c9150b13e8629711374df3e634f10b4218