Malicious PDF — malware analysis report

Static analysis result for SHA-256 12157b507ef09354…

MALICIOUS

PDF

83.1 KB Created: 2021-10-14 04:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9221000ba666c2c2a9473cfa893a8463 SHA-1: 81f9253b02dbaf003f6e330facfe8bc6eaf7a3e9 SHA-256: 12157b507ef09354d80ed713b4ca12454a66db206f1c38cadf75dfb6daa1a992
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs. Heuristics indicate it's a link farm, potentially for phishing or malware distribution, with several URLs pointing to compromised websites or disposable hosting. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.gonouvellezelande.com/files/83181346564.pdf In PDF document text
    • http://ateliergermain.net/sites/default/files/file/82366130129.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/affe259dcc6aa5d43e4ddb91984fde64/kesikifojabunufobavoziv.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/57868066613.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/vukakeburidiba.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/rakikigisodomiku.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/muzuduvipifowibugixibukap.pdfIn PDF document text
    • http://scsychem.com/upload/files/wofiberuz.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/12031189014.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/dujavezamadonevixib.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/kusamezita.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/lowoluxelagetubotelulu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8fad1dcecf54fd04186c8b29ed01c9f5/vodabutigatolitix.pdfIn PDF document text
    • https://artbynela.com/uploads/file/49653078165.pdfIn PDF document text
    • http://onlineauadms.com/ci/userfiles/files/loduxavuvurubakori.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/2928227524.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/11820479453.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/vabojitorifativobilozil.pdfIn PDF document text
    • http://yuli-china.ru/d/files/19890940833.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/25675578180.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/tidizofiwagozekulagepipa.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/2109161926205295834rcy5.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161652c371e13c---libusesuwurabibafor.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/kofesu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614532f797b11---naraloxadusotemugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/7xhmvLXWVJc/uplcv?utm_term=avee+player+template+json+free+downloadPDF link annotation
    • https://lapdonline.org/file/73874220765.pdfIn PDF document text
    • 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_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 10944 bytes
SHA-256: 78fbf25fde68617243a961aabc901cd64fbf5a2268136482d867647df1b42455
font_02_sfnt_off00010ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 19804 bytes
SHA-256: 842fac58dbffee5b71e72d97144cc1c42ab4e9689f358a15b813165a83989820