Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b64cfc23e3ad83…

MALICIOUS

PDF

86.2 KB Created: 2021-09-21 00:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c2f69365fa2371d886305938ad32e3a SHA-1: 66a8b0cb5f6376fc8f984051b618aa26ca6519ed SHA-256: 65b64cfc23e3ad83b7f4921cd3c55b5838bd049d4ffb2133fe57f21d0200573f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm and external URIs are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=offline+fifa+games+for+android PDF link annotation
    • http://snap-drone.com/userfiles/file/55833610647.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/genil.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/105204689.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b7b95c7a482f4738123238e43801448e/buwijazakuf.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/vigagumejotozul.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e2c222ca32ddc94ba870927b08d5c1a9/tadudivapokov.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/supov.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/90623913658.pdfIn PDF document text
    • http://fittbikese.hu/files/file/40673401623.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/zaromibaxojeberiz.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dfa61195b---fojolaperegewaje.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210908211551.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/memal.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/95172760728.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/80952951786.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413029ab499---bufamaresa.pdfIn PDF document text
    • https://seger.cz/userfiles/file/66094109249.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/44765750919.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/36703124663.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426d79a762d---77900523501.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/89753914676.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/44100245201.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/pasumowejerawagisog.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_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 10624 bytes
SHA-256: 19df74f6276f8e117ab0ca32b17f5d5e28495113f6e126759e070e319b5a3a1e
font_01_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 16752 bytes
SHA-256: dbbf0804dca6686fca7c0baeac60098de86ac8911d7d29024695694932fd8bea