Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0baabc6f1843131…

MALICIOUS

PDF

68.7 KB Created: 2021-09-30 22:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fee5016a636c6c08c52ce91e3062b02 SHA-1: f327ba7ffaeb01a338ebd7114a1653ab9173f1fe SHA-256: e0baabc6f1843131f62d37a689486e92ae92d9a5dfb1d3d98651a1394ecf7a8a
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or initiating malicious actions. It also includes numerous links to compromised WordPress sites and other domains, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://brincandoeaprendendo.com/fotosempresa/files/39150366075.pdf In PDF document text
    • http://ncteonline.com/userfiles/file/guvagapiw.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/fcc048d8200cb6add4f1c02bfd37df96/71912078346.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/78197320065.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/puziwadulusesologiwusojes.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/56176802063.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3ee4f04d9bc1f386b9888a9c671732a3/16965531851.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/87219933148.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/67575202490.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/taxerorotu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f02b6933507737f7185c4949ed5ef5d5/26999338071.pdfIn PDF document text
    • http://sro52.ru/uploads/files/tazete.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb69cc90c3---48454103411.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/nolap.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132b4ef3263e---rowirejekunames.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/783071078.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/fawami.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/48715052886.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/zoxenuxumupakabude.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153e596b9c76---sananidipoxaxexa.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/78213699633.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d896bb014---45098313212.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/2109020647584697340md2v.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/zisuluvisujukadaroxuvuz.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/binurotoxow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cara+rename+file+di+androidPDF 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_off0000b1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C8 14708 bytes
SHA-256: df31308aefdd1884078123b633800dbf493264ac4b3c8f6eafe520a6f18c82bb
font_01_sfnt_off0000d682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 10280 bytes
SHA-256: 66e45e58ef54b6d89ccb9add90c22ab1e8e2eee7284cc9ab5d9a575f27f3fd35

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