Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d03021116a46c0…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 01:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5979d300414082150db81f1162488dba SHA-1: cfff9ee444f5769aa99208c64f9c82fe5534f166 SHA-256: b5d03021116a46c0ce77d6c5ae35f4a7e98664341dc6231187faf96802d9c7c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it functions as a link farm, directing users to potentially compromised or malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://garglob.ru/uplcv?utm_term=hide+status+bar+chrome+android PDF link annotation
    • http://carrozzeriardue.it/userfiles/files/kanororapazanajajiwepaga.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/53364394427.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/danuremefujatufef.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/9056785322.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/tidesobidozoxizodo.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/48893496957.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/79937722574.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/koletivejimutivo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/718599c5ef0c273dd95e9058f2f39153/nijidosajodik.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/wexelefixazew.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/3954482582.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff706bf8ca---lotapazodavolenedawerebab.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d9536398bdda20b0b2f364eaa716a286/bimogujejigebabuzijivef.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/21944551631.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/90569021661.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/25389011058.pdfIn PDF document text
    • https://maisonforville.be/documents/file/poguxufado.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/xegiladiwipukizozo.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/bijupamovalin.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/57848725096.pdfIn PDF document text
    • https://senegal4d.com/contents/files/93127701545.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/digometolovozegadufonux.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_off0000c532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC532 18312 bytes
SHA-256: 47797ed2c23ffa2c9365ec0329f0e45e86ef0cfee11485fb3d8c47d3621c7b0a
font_01_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 10820 bytes
SHA-256: c8e53d11d7e68e15c689166d94901f96be85ce87cd2496c42fd963aa187415ab
font_02_sfnt_off00010d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1