Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37248720c0fde89…

MALICIOUS

PDF

85.1 KB Created: 2021-06-29 18:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1119b5e31092367e0fa0a861278600d7 SHA-1: 53404784b8e75b442462286c2538402cc5002be8 SHA-256: f37248720c0fde89c4720f18852863e208af40d2a58a4e1ae5544547e3feba19
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for phishing and trojan activity. It contains a link farm with numerous URLs hosted on compromised CMS uploads, suggesting an attempt to direct users to malicious content. The presence of multiple external URIs and a link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/nkid1804v36u2v3es1na21b1t6/turopebab.pdf In PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79e9ed0ea---xatinewobupusasijep.pdfIn PDF document text
    • http://mfahk.com/upload/files/sirawurokagunerefiti.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21ca2d28bb---49635426999.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad0c32a3f---24483027348.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/6c1be961a4021121374856be1daf0917/10157599267.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/18872147352.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/008fa44761534f8ec5bda22a35833ed5/9960193565.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/15554069214.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/cf5c48259a214385ebc1ff1b39f60d1b/67453715738.pdfIn PDF document text
    • http://hydrem.ru/images/file/43811531693.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210619173656_g3kxmc.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/kazikixijesawe.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ed0cd9350---kotegipenuxegafiriwigilon.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724f5bf06b7---zenafirani.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/052225161256.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d5bd4163d169fc20d4712a6165511e9f/bogagaxefemi.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba57a747e5---koxosasemusawolew.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d13c32480d---52260986653.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/1e1ca5c1a228445ab37f51a15e34dca5/52565111178.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/77920538056.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd61e42b047---60749592046.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/xodofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=install+adjustment+layer+fcpxPDF 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_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 10964 bytes
SHA-256: 81d676ff9639068270e788f2ca7f799c5cc11b7fb4fa1bbeb97967c3708c4e7e
font_02_sfnt_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 18096 bytes
SHA-256: 27f63ca26debf425772c80d26cd6e640262d7ff45e7465e723d9cf76f8ff4e90

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