Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8a94cefe766b3f…

MALICIOUS

PDF

114.4 KB Created: 2021-07-04 23:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a9ded80ac6023fcba3a774d127099955 SHA-1: eecd2279675dc9ea6405e8f848fc1bedfc1ce616 SHA-256: 8e8a94cefe766b3faf899323ab2a215a22366edea9f9c46c7df86fb41b7c2802
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://qianxish.com/ckfind_image/files/96049918611.pdf In PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/fa1084c06af183c45df7fc9806322a35/gibafebatilipewe.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mbp5ignf1p303vt40i7l969652/24704510404.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6a407d67643f08280b98023e0fecd246/34406628332.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/88b08e64a95f79a4caad42add471e99f/60643137425.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f9fb756f6---9655254212.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/5606985769.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/56224660441.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/revafupawukimuvitigoxaxe.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/ruzularawiwikesefalen.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b25b93c648c06096e796ece03c539a78/fewekuwodariselejajerad.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcd03cabae---bugusex.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/zakorebeb.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/59978963355.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810a43e2b85---zopadufavinonike.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/59037286337.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609dade913d49---69811468566.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/75993941242.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/43431743874.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ta44rmb7f45ve0gbaqmairseg2/lopetatises.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/vl4dd5cktl22ul421s9mfo1agr/sifide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+new+counter+strikePDF 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_off00015c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C48 17992 bytes
SHA-256: c70d50d6fc1d0c1f84cd50b5bec0f569fbb4c7c833f400c1472d39410663229d
font_01_sfnt_off00018bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BAE 10360 bytes
SHA-256: f603b921aca4d637a5876333721073b8503811e426c21c3f53ddd869a45b5267
font_02_sfnt_off0001a324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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