Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae390e8975d00320…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 03:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5019d4480220cf78a1cddd50e1ef4c32 SHA-1: c82d096ad93666e26fa7d259c07eb0f5e88fdc41 SHA-256: ae390e8975d00320ccc3f61e9d74b834aa38e22690cddd8d6227753728bfe5d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with spearphishing attachments designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://apc-algercentre.dz/ckfinder/userfiles/files/41724716413.pdf In PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bb44cf6fefd154bf5a8c6c1f184dd6bd/43615223230.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/vamunakuzime.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/9815424863.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/60869329242.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/2429889148.pdfIn PDF document text
    • http://besteva.com/upload/files/zivikemasajirit.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/ligosudelibavowolinazimin.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf8bba8b4---46005501340.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613798d05b65b---28267463768.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/57278042388.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/moragigafaruwibipadomi.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d98e639a13---20136971908.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/30331174079.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/65543836791.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/xigexizunodovef.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/51972301052.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/nosipaxolujem.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210902_041928.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/merigisokotadeka.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/38989457582.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/nowatawitirunusuv.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/luruwumenebujofasezudive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=basic+application+software+examplesPDF 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_off0000d459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 17304 bytes
SHA-256: 2aa88b784d3d5e7834a46d60c7e92b1a794f8e3888bc15a4a0159834142bca5a
font_02_sfnt_off0001193e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193E 10884 bytes
SHA-256: 725d379e7c6e32921b9c4d7e6f2e8bcdb4efb639460b9606207e33dbf9b4146a

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