Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e04cfe1ac8dcb53…

MALICIOUS

PDF

89.9 KB Created: 2021-07-25 06:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ddb303194c924a3e6f7c4e791cf09f8 SHA-1: 0628129334af96fd25b8273574804b84bee96139 SHA-256: 8e04cfe1ac8dcb53f687aa6b85273c6acc077bd6590038618b32d98811ee57ef
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The PDF structure and link farm heuristics indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b67c995f911---10595856597.pdf In PDF document text
    • https://perfecthospital.org/FCKeditor/file/87492728984.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/74559434810.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/79011567136.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/b27tso6eh7183b7us8pr7tuet0/tuwuko.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d389dcb7f44---wilepunilokudarete.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/negaf.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210613000005952.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/zodulu.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/46925528314.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/68dfbd2abe7a0bba384470d604089755/fuwazojepinik.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/da0b0b1412e6b6ab8717b242165f3495/lazowuv.pdfIn PDF document text
    • https://spacio.hk/attachment/file/83138114726.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609acc126ac87---zavefaduzad.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c3ef4085---faxenas.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/jamusexisifodobadu.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/9100379836.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/2528237282.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0bf6a65e2---97193365181.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160870f8926ee0---35441430441.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ea8b580c618362d2164a0935293291d1/39897336651.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d041589cc9a---84039321495.pdfIn PDF document text
    • https://artbynela.com/uploads/file/89079479174.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9ad7815bf3edf3b819f42ab607f34c47/jekimulesejununibejekumaf.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc70a6229a7---sasulidalitapow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=crash+course+us+history+episode+8+answersPDF 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_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 11104 bytes
SHA-256: 0922cc7c62cb52070699dcac414812bf6f464168fbae5f20176d75b9eed9fa41
font_01_sfnt_off000114e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 16900 bytes
SHA-256: 2d93bade775ea4485b53aae5444a31ac42643674dd48fd7dec8976dc8e53ef64
font_02_sfnt_off000140a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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