Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff18ee29258e249…

MALICIOUS

PDF

90.5 KB Created: 2021-07-06 21:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5d953b890f21162bc8dda1c53ed7b822 SHA-1: 95a9d824165d8171b6d2d40996bd4dfad1a10aea SHA-256: 2ff18ee29258e2490a36daf892d58c63c3f29e27d606e383d54634a7f77fe258
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other domains, suggesting a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristics point to a malicious PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0311fdccc69dc6c013fe22ac483c9533/21698925940.pdf In PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/82515978281.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f69e6528672ec2509a4a5574cfda56e1/6214874589.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/sixalitina.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160946851835b6---22927986895.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072beaec7903---ravegimila.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/70084742563.pdfIn PDF document text
    • http://jucal.es/images/file/65405150827.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a39120bb0c6---83780296106.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/67242286281.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16079f6c4bae6d---nipotazadu.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/97754170389.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608533f6345f4---suvanafu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607742ae49961---nezibikaxofigugure.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d645925b334---vibuzal.pdfIn PDF document text
    • https://ancoraeducacion.com/images/983529888.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f660fc24dd---94038984502.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd63d2c0ee---mubepa.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/9upg95om7r60hsac5sps76tqac/ratetazirorafumes.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/918a66223059a4bade7ce2e4fe4fa489/suxukojamasukodexop.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/j6eion6ue37ejohi83r5u086pg/70061795984.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/66006300011.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/44280384061.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d5404b627---68307726088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=daddy+issues+meaningPDF 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_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 10440 bytes
SHA-256: 9911d942536d03e30a47ac7aa3ca492ceeb8607feacbaf429bcb9f6376e4399a
font_01_sfnt_off000111f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F3 19568 bytes
SHA-256: a96aec72ae46631196e606968e5c8cc4bae899a65a3d82767faaaa5a4905c5e6
font_02_sfnt_off00014367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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