Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8421cc9e76f2309…

MALICIOUS

PDF

78.0 KB Created: 2021-10-15 14:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb5c4d3337fed3916380899e3c459382 SHA-1: de41eebf2759473719173ce8220fabe858fd438f SHA-256: e8421cc9e76f23093ac4da6522d877e63736a111e5c6ad8106849ef09eedcfa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f5f8d293f61c75c8a5e5faebea92efa2/dudujalanobiwelazowokitoj.pdf In PDF document text
    • http://beiwendq.com/userfiles/file/zoxujobaxevoxasuvigu.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/54359531211.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c1e86b088---32200108258.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/0b4f686b8f69bd4a6605eadfe165c3c2/rilezo.pdfIn PDF document text
    • https://promoxcenter.ro/ckfinder/userfiles/files/rukalisibejaweraxisarik.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/12899608.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/dojogixibunogoraj.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/xotenu.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34283631425.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/17847015729.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/53396453411.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091517382773499.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/munefasowigipozagusedota.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/gewito.pdfIn PDF document text
    • https://argumentua.com/i/file/29928948606.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615639b462643---81113973698.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/jbvnf6jt131gl4t8tguajul3ie/21073046149.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/54805415360.pdfIn PDF document text
    • https://noclegsosnowiec.pl/eurostyl/photos/file/79206004866.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32d3309c20a8834cab102b338d18e909/vokeraxulefokivejumobamo.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/nunakexo.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/33478965546.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/kexevexonaguwutikaxowikob.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HTGXzuRVGb4/uplcv?utm_term=list+of+african+countries+by+gdpPDF 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_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 17184 bytes
SHA-256: 0c29caf807e8a08df5db3ee5968a0f1282640ddbead42319fa79a7c1f4e9349d
font_01_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 11060 bytes
SHA-256: bf0d1026dad2ea7b8319a9bfd349dd5618761e86aa22c5b6c07b28236b83b23e
font_02_sfnt_off00011216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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