Malicious PDF — malware analysis report

Static analysis result for SHA-256 6647313a6b911b23…

MALICIOUS

PDF

77.8 KB Created: 2021-09-08 17:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae345e7f2c14aad557fb3793229aad45 SHA-1: 2afba20fb2093f8f7a33ae685fcb02abb1108d24 SHA-256: 6647313a6b911b234793f7fae2f45c2188668b34d3a756adbf28aa9af4ba8e65
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to potentially compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The 'SE_INVOICE_LURE' heuristic suggests a phishing pretext, and the ClamAV detection confirms its malicious nature. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://poetische-malerei.de/web/editor/files/41067547927.pdf In PDF document text
    • https://osakadentalcare.com/contents/files/55544538646.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4965ab64---12985623143.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/zadimekeleper.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090812583860.pdfIn PDF document text
    • http://co-mit.com/uploads/files/tititoxa.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/92466830985.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/70960421780.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/gadanelixizowekadibaja.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/48203115022.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/13538229506.pdfIn PDF document text
    • https://ismart99.net/upload/files/39415358598.pdfIn PDF document text
    • http://torgoborud.org/images/file/danak.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/kufenalub.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/499308910.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/kuzexef.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/82463020128.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/81040013534.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/3e1436ee9360f2c24871ec4dc29ff194/mofagifetajixot.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/ferizawupuxaz.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/bolokovoweboze.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/43b1b7626d7dca49a65c560d40adf073/nowivedunegifikexusuj.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/59994895401.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/34938849127.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/69459325521.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a1406dd1---vubizuboziwudepebevulokav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=partnership+dissolution+format+pdfPDF 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_off0000ce14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE14 10864 bytes
SHA-256: d7c511ce8df15b71747caf231233eda0006c78b72ab314ffc873224916adc531
font_01_sfnt_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 16656 bytes
SHA-256: fbc920349eedae0f7ef3e2e7237b89899058a3eab98d1be9ea8f1da1c06c120e
font_02_sfnt_off000111ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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