Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6582dd257e55fd…

MALICIOUS

PDF

76.5 KB Created: 2021-06-27 02:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 987201d9ab2e46df588af4de5f7af3f6 SHA-1: df61ec0d52a02e1a47b657f68fcabbc550a19ec9 SHA-256: ce6582dd257e55fd8c52a5775614e0de5c3688653b357e4eb7a13600bb4f2784
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic for distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://littlepearlspublishing.in/data/eimages/file/raduwo.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/573de49d5fe72688104259aee395cfbe/32200784420.pdf
    • http://dermatologomiguelgallego.com/miguel/fck/file/8779893202.pdf
    • http://nbpcpentecostalchurch.com/clients/65183/File/zuxubu.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nf657s7o3us17sb3do0vf67jj1/rafixezojinu.pdf
    • https://bikeid.net/ckfinder/userfiles/files/zobokozusepaludipebedute.pdf
    • http://alarcon-v.com/editor_upload_image/file/kanefuzulezumitubenag.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/27989091938.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/331d1d8098245b995a1abadfeb6f3226/99528800565.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc9becb029---1975287496.pdf
    • https://bamor.org/userfiles/file/fexuzo.pdf
    • http://sjhrz.com/images/upload/File/25726341925.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933f433e136---30193070782.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160795522b2bd4---25727274143.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/247af265ef8c8a52c2c090648aba21c7/bafanunibapi.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/53054564712.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609217a3203a1---kutavumujilawaxu.pdf
    • http://anvlaw.com/userfiles/file/sujekalorunawad.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989fb21e78e---15103440751.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c97ed2604ee40ff83e39eafb6c74eb0b/wararuze.pdf
    • https://girilawfirm.com/content_files/files/rokexuwu.pdf
    • https://avela.md/userfiles/file/37330786593.pdf
    • https://agatanorek.com/files/file/zozigirogemabejinura.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=5+star+heroes+empires+and+puzzles
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c625.bin
620a909dd1db9b9c5e05c813618cf57b7dc78a247f8330a99ebc728c30957bb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC625 10856 bytes
font_01_sfnt_off0000df09.bin
6314ba991e767611df9427801aa9f3534e2b4d5d942c97c50a910089a5ae5d7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 17832 bytes
font_02_sfnt_off00010c93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 16792 bytes