Malicious PDF — malware analysis report

Static analysis result for SHA-256 d139e4d64406e93b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-22 19:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ab317e2f9783652751bd176a170c218 SHA-1: 3b9c34d189e7d69a8969a0c940709926f51d67db SHA-256: d139e4d64406e93bed662d57f77eea1a307144dd9c74d678a6ce6d0bcf92cb49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to distribute further malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/wajevujasawozat.pdf In PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/fefesoxojin.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/94403646347.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/51801708543.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/zebobedeputabi.pdfIn PDF document text
    • https://bak.vn/upload/files/zuwajalurojibapipibezu.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/81781626466.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/tepebe.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210920190155.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/figutalozor.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/wukuxibozepevulewim.pdfIn PDF document text
    • https://nomortiga.com/contents/files/84071880051.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c27e13e9c5---dulomulojetojunilitulili.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/61839273705.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/pakuromoganelajuzadem.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/65553086163.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/34936631799.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/xukomosuwome.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e57487f84a---27803811792.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///57126621102.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/fegulegubixeze.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/wumibodonibadometobabew.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c1b319a35---56835465568.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/nerenaxomurarub.pdfIn PDF document text
    • https://seerupit.dk/assens/file/41675549111.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/87324431299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=functions+in+excel+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_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 19012 bytes
SHA-256: 8ae3e686ab0eb0cdfc8ab1ac328f14bf1fd5353c3c50e34d6daebd43b7bdb868
font_01_sfnt_off000112fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FD 10532 bytes
SHA-256: 3405537acf22b6da0cca9f86611420bc67d5a0786aa10f9b169b5755854b3813
font_02_sfnt_off00012b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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