Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad39dea49406de8…

MALICIOUS

PDF

97.4 KB Created: 2021-06-30 16:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2d09cb83a6b00bde5141d5f9089bf8bf SHA-1: 31eb2c52e743b737d1c4a1820019503cb8c03cd4 SHA-256: 3ad39dea49406de8ee6bec034def21e8a45d80ec675aa2a93c3e2e0cd52d8ccf
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://huntic.ru/uplcv?utm_term=lesson+2+homework+practice+geometric+proof+answer+key PDF link annotation
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/724ec8b6d2fad12c6e29572d0a0f50f2/jodikudemirufozomabinor.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/zipefoj.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/133012f7d10e1c01c32995287711be07/pojiri.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/6005888084.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/39617899941.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/lavetizujulemalu.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/kiwulaxoxujagu.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c5396178---69830861202.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/6fc6147f546852eb9ed9ddc0a80870ff/vetex.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0759385c99---xumafoxojobotuzo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb169e7467---94125375854.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaed5a834b---sekol.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b268c1bf9a0---vuparaxenizesewo.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764e94cb78a---41776105638.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bf7d84053812af64e0f57583146d0ce4/bigojedelijukerag.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/sepivatososibifajusat.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a758892b316---80865541899.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/07adbc48a0b80fb6333d20808a2d6b1e/suvojisamisedadokedegupo.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202106240109359944.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/nodugujefexipivog.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079de0384267---laxutupix.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fc45f3dbd---juwufebufifobovaregesov.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/rukemugilimemuw.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f0474fe2957efcdff4d7b3bf44535364/84730981383.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/83185800494.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 19800 bytes
SHA-256: 127d924ff41bfefc74db248c71f3b6a412a830d07dd2d342fe24c1105f7c4245
font_01_sfnt_off00012de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F9 11248 bytes
SHA-256: a88f827511a21abe1f5913407ae7edee30a84459c52545aae143d152c43a5085
font_03_sfnt_off00016057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16057 16124 bytes
SHA-256: 06ffa8173eb588fec3a05e94d055eacf65c096f246e92b39997b834d7475e4dc

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