Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e1e8880277454a…

MALICIOUS

PDF

75.4 KB Created: 2021-09-10 01:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e10a98eceb23def0dfa7b35f51eb36f8 SHA-1: c334e00b7a00b9d15ffea518b08c334331b55382 SHA-256: c1e1e8880277454abc543c57b049b39afc9611d258036fd0639d53d627377781
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicate that the sample leverages compromised websites and disposable hosting for its links, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://shinko-tw.com/UserFiles/file/dedalorubifesa.pdf In PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/8571620027.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161393f4e245d6---29848457569.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/62796695722.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/masazagovobiwelaxi.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/43837438580.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210902074855126.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/52c8eed52186b485ae8794033e76847f/16377122839.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/dodorovalopi.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/52418602175.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/samipekuweve.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/mawuruvisotoxuradobujot.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3c68b6a1---99579327279.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613737d36f98c---noxujumejuxo.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210909_122458_9691.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/21940810881.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613168f7eeb04---91207133589.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/54333446296.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/38622410998.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7f5af7409aeaea76c564f82cf7527265/lufotemapi.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/reluw.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/58d92haqtsbo9b4eln8i9favq2/37452030380.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/58756558169.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/59419388703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=answer+to+61+on+impossible+quizPDF 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_off0000c1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 10984 bytes
SHA-256: 12af04d195b4e94551ff481b87c5ac18cb1b0b44dc4aa302b50252cc5b9797de
font_02_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 17384 bytes
SHA-256: 74465d1803baf0a8446eb9b8ecb93a2f0d77dcc1f03aaea27be55939471c3c0e

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