Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0960fd79a4b29a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 09:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0a994ad7297515622363f93e8e83c67 SHA-1: dca1fc3d9d508d766642119fe01dfd567f099694 SHA-256: 5d0960fd79a4b29aaa336fafac5970060a26de7afeb2cf8b5d4335531f432005
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users, potentially to phishing sites or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gartenbaukoeln.de/uploads/files/wojotugun.pdf In PDF document text
    • http://chokmanee.com/userfiles/file/gutugibovokeba.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d3cf2cd7d69811e53739bb77ce329c64/tukebilezefetujemafipe.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fidv3fsbl9gcgcd25ojdfoj103/lidusimisujiparamifafo.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/koxavomaxuduzujaginina.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/sovupadasili.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/tesufilekosumivupeluka.pdfIn PDF document text
    • http://mega.kz/media/upload/files/lumebeko.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/48186484799.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/52539717569.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/73337853874.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/gasemasuvafobojusume.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476c6aeae48---93507465345.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/bodemumifenidilurobo.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/76165555461.pdfIn PDF document text
    • http://woykoff.hu/upload/file/xoguzowopuvizo.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/76212208250.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/xovizijojew.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/xudoluwotojisitef.pdfIn PDF document text
    • https://dukupahit.com/contents/files/vamogijodebonewij.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/39971865740.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f5e769588---8460082288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=playstation+3+emulator+for+androidPDF 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_off0000b07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07F 17060 bytes
SHA-256: 7594f45d17948dc52ba824b5ab6d032a4bb636323dd351a30c90962b1b59c766
font_01_sfnt_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 10904 bytes
SHA-256: 440d9074f8f5dc2cac029d54d04c8ecdce7e9d110acfecbe71b9f5eaff2e7b7d