Malicious PDF — malware analysis report

Static analysis result for SHA-256 24efd0612e34bd5b…

MALICIOUS

PDF

85.4 KB Created: 2021-07-04 03:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bbd05b267dac17fece737c9f1eca44e SHA-1: 17fdf8811fb868a39f307789db3928b346e8c407 SHA-256: 24efd0612e34bd5bcbdb68ca529d86d3ea27b3e3b4ff5c6a85cc12629da3ff63
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/83skv4edti3vkf5nlc6kt3klq2/tawojujefikebakojejopim.pdf
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/77033068241.pdf
    • http://hytechplus.com/userfiles/file/31413577988.pdf
    • https://hotel-la-licorne.fr/userfiles/file/zenegurilir.pdf
    • http://afghansolar.com/userfiles/file/48430287474.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/9840912eb4fc12811d5a27c496c012c3/solasul.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6bb358669---24329257300.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e1f82f8f9---balafisulebakumafotatugu.pdf
    • http://dichvuwebsites.com/media/ftp/file/jidaremobow.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7412f3690f---80200467881.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/pidus.pdf
    • http://allycatering.com/userfiles/28542958911.pdf
    • https://bbpartner.cz/userfiles/file/24771043385.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0ec0de1a0fc1879538a2c35792c4cbbd/45330931834.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/f8203205d8ee4a0c8b5ffa22aa92e6b3/ludubafiluwiwipidoza.pdf
    • http://esoftland.com/userfiles/file/85826290027.pdf
    • https://tidurmalam.com/contents//files/kedufaloza.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074891d22b86---67787397128.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079192358218---67645968791.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa28ab9ef5---67838578766.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/jj636qr9hfers4m1njccbq6n50/xesotagagipadi.pdf
    • http://cp-1.ru/userfiles/files/13199816534.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3afeccf7d---busonapojurejeluga.pdf
    • https://majubesar.info/contents//files/25021822460.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609df6d7f1ad4---14690299569.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=it+is+very+costly
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d495.bin
aa04367d68038cb446273e60b7c0a90585e650e4a725efedb4c66c99e8bcb218
pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 17908 bytes
font_01_sfnt_off000103b9.bin
8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 16060 bytes
font_02_sfnt_off000118cd.bin
eba66e8a0dde4199ed85e87fa182f1b97dff948c78fe844c160cec5bc8f72d86
pdf-font-stream PDF embedded font (sfnt) at offset 0x118CD 10088 bytes
font_03_sfnt_off00012f75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 16792 bytes