Malicious PDF — malware analysis report

Static analysis result for SHA-256 399db8bf48adaa10…

MALICIOUS

PDF

94.7 KB Created: 2021-09-11 02:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b57a61b98ce650eea912c3ef6f9823f SHA-1: fd97fb5a00d63cc20c87b153cd5d8485baa331a4 SHA-256: 399db8bf48adaa10fc073fb81d95092b7aab38f21adf3533a8abb161c1c3190b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=fake+gpu+android+no+root PDF link annotation
    • http://verypool.cn/images/upload/File/8015091415.pdfIn PDF document text
    • http://arsvet.ru/img/upload/wufaguveviretokevisibefo.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/zuzojerawatusariliruxoti.pdfIn PDF document text
    • http://dhf-china.com/d/files/41295214170.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/77216068552.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613265f5d54b8---xokusuv.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/wazomogigusupadudik.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/57871237234.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/26349832351.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89faaa943---fukegepiwezibedinepu.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/tugisigaju.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/15269759418.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/zusowitemoliposojez.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f63c373104---47531424732.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/21139986586.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/27880032061.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613443a196fca---lisivuzo.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/kikukejejuzo.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/fovadovi.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/54261253644.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/36231650158.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/zexavifodeto.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/mifusevakitonowogape.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/12189645473.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16138aabb2d59d---xinefisovi.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_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 18776 bytes
SHA-256: d48c90355d784461a28ac332605a60e6e2e68fbe1c8a3e920b12f39cbf2016f0
font_01_sfnt_off00013d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D53 10520 bytes
SHA-256: 30a662e6b05da16fd75b8a75ddbe0541b95401d54dceff67e1be7dac4e0a7f49
font_02_sfnt_off00015524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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