Malicious PDF — malware analysis report

Static analysis result for SHA-256 651a5d4f7a220b84…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 10:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f770a7ce48f4390e43c6bd01c1fb0b8 SHA-1: 25b05eb01f02a07df8837e97b86a11c619c26c19 SHA-256: 651a5d4f7a220b8436444a2654f05a4f96ffbcfc401ec1d3bdb25dd167c24cc4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://cructi.ru/uplcv?utm_term=how+to+view+private+instagram+account+without+following+them PDF link annotation
    • http://www.findvoters.com/userfiles/file/fopaxujoti.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/lirabimuxodejakasuruxas.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/63956028678.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/duzuvije.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/73725680708.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/tanadatin.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/eca99233182d4a9a8dbfd25b71f447b1/19404672641.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/gevogozopisogu.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/28911026334.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/zoxupofamase.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/73274687087.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/70468124594.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/patofoveti.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/1769379169.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b4a29b55ca1d92cffc62519e7b5db6ab/pesupabuxefesoserof.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161345f0d27db0---78962050386.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/vixotu.pdfIn PDF document text
    • http://apvn.info/userfiles/file/71953886620.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210916071913.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/wotupotawisabebizagutus.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/matitirodogunabipagevo.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210906192623.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/buwipaxesuxulav.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/58366649965.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_off0000d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 11168 bytes
SHA-256: 5d83c384bc5e2d6ae91b8c4a131a40237cb7db2d6880cee4c05a2322acf238b7
font_02_sfnt_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 18496 bytes
SHA-256: 6038c11af51de572b03e8358cee38018d18909fc04633bb5e21d8b4baebd3062

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