Malicious PDF — malware analysis report

Static analysis result for SHA-256 5782cf5c8d02eb72…

MALICIOUS

PDF

91.3 KB Created: 2021-07-07 18:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4a1e63f2240188183912944392b102d2 SHA-1: 545b1a1c1f92bb0aa89da2ca40c81c271db81134 SHA-256: 5782cf5c8d02eb725adb3be43d48a97efbab9891835dda1de8a3c9f30734edde
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a high number of external links, many of which point to compromised or disposable hosting. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://guides2alpes.fr/uploads/file/98762652822.pdf In PDF document text
    • https://tyko.pl/userfiles/file/fawedipebaxuwugalonax.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/n0qr3s6qfrcskeqtq5st70psnq/14517924621.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/fiserumupew.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/suduzodenipom.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/xokivoxuneboropumi.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/xizilizelijogafotulaxidi.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/rlkd7l0kb5jc7l3inss27hq754/37958688749.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/52754968220.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/39c33d8bc73421f204a0276af27ff640/17542685604.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe1278e60d---87314627941.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d808bb8d5f9---lalitovozifimapenugidi.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b216917fee9---3326111502.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/8165246595.pdfIn PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/tozalemupoxaligarefi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8e269634---20541995002.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/eb69e429af3613444e526ce291d72ad4/62091233351.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/42484969386.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9ccc29f1618ff2f407a71e0414aa2b8c/wajavuniwojetejipalelewaz.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/18190311530.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/patajoka.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078b0785c70d---lolalularijiwupobujokanil.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/jujarelaxa.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609496f1e74c4---ketadafojagagewubipib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=complimentary+words+beginning+with+jPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 17028 bytes
SHA-256: c43eff275de7c8f135c47a1bc844a2cbfa85ecb30659127310b73f2bff1430f4
font_01_sfnt_off00011731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11731 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off00012d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D12 11340 bytes
SHA-256: 1f5dbd101ad571b929669a9089e85eb6609394a29c94eb370f2106dc3120b0dd
font_03_sfnt_off00014727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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