Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9987b7511f6d02…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 05:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 10712b43a423eab5eaa8d3fd24620892 SHA-1: e7902d80683fda30714887be6c0f0cb8e03edc84 SHA-256: 8e9987b7511f6d026ec0b98a68b07c5c14bcbf28bbd4e273fa3d7d717709fdc0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm or phishing lure. The document body is unreadable, but the heuristics strongly suggest a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328d8204736---kejidagex.pdf In PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/84314535179.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/zogesatezuvidesozexakage.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/dekebase.pdfIn PDF document text
    • http://skolky.info/foto/images/file/88768581837.pdfIn PDF document text
    • http://praguetransfer.com/files/file/pepinorivafubejow.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/78019470623.pdfIn PDF document text
    • http://skisun.it/userfiles/files/pufugigubawo.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/72883362190.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/sidelaroxulexegepetemutim.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/geluvolokojelo.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/rigakoxatixesalefirudak.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75cfe37cd---46386402125.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/18235827532.pdfIn PDF document text
    • http://protezas.lt/i/File/sedabekolep.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/narumenadilaseged.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/33750403750.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/19901209391.pdfIn PDF document text
    • https://megashina24.ru/files/files/dobonadakuluxuwefemovi.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/dasavotobikipetipafawel.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/pufexotom.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/9150328897.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/ridakukagixopomafew.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b706c4fcc0---67554207308.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ade27e2b7e6f79f067ac77503d550ec1/60882367824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pel+android+led+32+inch+price+in+pakistanPDF 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_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 17824 bytes
SHA-256: 3c2ad677dacba237bed48868b4ef9648138ba35d62c2a35934b5bc5dadabafeb
font_02_sfnt_off0001245b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 10996 bytes
SHA-256: 5fe3aab567fb73cb65a28505c2ffa3ca4fa21ec240a1a525f5b81eda9ca2411d

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