Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6f9af0c3620013…

MALICIOUS

PDF

74.1 KB Created: 2021-09-26 02:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7703f2e4483d8639137398cce042e00 SHA-1: 98ae7345ab84c048a56088d8732e92f271db93a5 SHA-256: fb6f9af0c36200135f7e0f23aa917d8c162f813b31ce49485c7f8081fce2fb1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded JavaScript stream and numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malware or facilitate phishing. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=man+of+the+house+apk+free+download+for+android PDF link annotation
    • https://inprovitchile.com/ckfinder/userfiles/files/vebugusifopopi.pdfIn PDF document text
    • http://12shio5.com/contents/files/vajifibowaselivinar.pdfIn PDF document text
    • https://equalland.com/uploads/File/potikis.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/xewoxewakubefelubelif.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/gemodetolape.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/95157807081.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/dezeko.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470b028193b---fidepat.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdf6df398e---72236567351.pdfIn PDF document text
    • http://crm333.com/documentos/file/vurodorekubidomofote.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/18938443767.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a055c0243ccb78209b5e0ab6ff64232d/90590024949.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/1985536450.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210910191408_df38ib.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f968a98348---xavezesijoluvominakut.pdfIn PDF document text
    • https://siroyensao.com/upload/files/62938111634.pdfIn PDF document text
    • http://vladekoservis.ru/files/74714324514.pdfIn PDF document text
    • https://training-access.com/upload/file/49874509486.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9dc0e8afc---39727029307.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210906100626.pdfIn PDF document text
    • https://bdata.vn/upload/files/govolaxuliwunili.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/88508840290.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/lndo99blusndrbsp72iv0r42bk/wefaliwi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/3abcadf71b9255d4996384bf55d5c49f/43236864024.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_off0000b73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4C 18544 bytes
SHA-256: 8b049dfad16c6b3585f7948e6cdc1fec0bab838ff8e5f25ff259ccdbe1868b79
font_02_sfnt_off0000ff23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF23 10864 bytes
SHA-256: a2797a79f7748ea884c08dcf088f4acda11000d1ad2333a85ddc8c0b14d8408c

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