Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b903b36d74fda4c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 14:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4ee151bd95b8df402ac93d79303b35e SHA-1: fa3c309433300c440baf3899642aeab4e747fac3 SHA-256: 7b903b36d74fda4c6093c975335f0a942f97063d5f7dd4f455e5dab1c9a08f39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, indicating it likely contains malicious content. Multiple heuristics indicate the PDF is part of a link farm, directing users to various external websites, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://angkaganjil.com/contents/files/zajisupizifewef.pdf In PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/5f555e1a6c91c90dfdb8376d05d8b31e/17969634530.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/povile.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/wilobaxixuben.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/pawefurodeko.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/zexatowax.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/cb6b68814d4825f846e6104373f924e6/xidezelili.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/vuvusufivevusub.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608917f931c5d---lifasokubetubigovalakij.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16120d163ef7d3---60066010762.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/fbcef574958219a4818d68cec559186b/31578861641.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/3c687c3c62dabdfd28f9d1b6a0fd1ed6/lubisudonipijedep.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/putizozof.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/d582da95e8df979e2998b54efb36f3a0/27581799825.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac40d53a45e---lobatakutowibewelezij.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/77790106358.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160973ab1cc07a---zezovukupufumabavebiwugi.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d67f0162a68---33941264851.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/fogojoxobajiritoser.pdfIn PDF document text
    • http://timebymtm.com/upload/files/kuruxezutorapudit.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021051922042577935.pdfIn PDF document text
    • http://pololanna.com/user_img/files/zixox.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/xesupubalujipemajakaf.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/96330343898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=stepper+motor+interfacing+with+8051+microcontroller+pdfPDF 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_off0000e002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 18408 bytes
SHA-256: 757e9be5baf781b8c7ae9510d1fd694cc6718e4e933ad5f748694ac5556921bc
font_01_sfnt_off00010eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12705 11576 bytes
SHA-256: 36603dc309b346f6830dd9d450f01cd988b7050d2513f5b03fafa36841a6efa1