Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1d8421d497e77e…

MALICIOUS

PDF

70.6 KB Created: 2021-09-13 07:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b71933361d9644846b02b7dfad6dd02e SHA-1: a012da4a3ea939f7cbbfb9d9795d8564117fec2f SHA-256: bc1d8421d497e77e942f745540e91e3026a0d3345daed60be10afe619449581c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead the user to a malicious site or download further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://journalofcritique.com/ckdosyalari/upload/files/tezozasumalidufux.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/53amccuf9fm3v7ldsbpst4kf76/jilivafaluje.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/tipoguzetofuligilizukew.pdfIn PDF document text
    • http://hmed.vn/upload/files/57475981955.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321aa3b6d0f---mitiripokuzinipap.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210907205307.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/kelewunoluw.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/logiligire.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/31439201014.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/56832149141.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/42615054034.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/subipurulupok.pdfIn PDF document text
    • http://mega.kz/media/upload/files/vewuvajavozuvapo.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/33767832531.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/dukow.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/71559743700.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/lajobozubezitozu.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/15793451994.pdfIn PDF document text
    • http://ifap.it/images/file/74114723039.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/90749701080.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352fa55caa1---25668950394.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/sorapiwezadorogolanazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pogil+activities+for+ap+biology+answer+keyPDF 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_off0000b3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EF 11152 bytes
SHA-256: 1a5e7dfe3355444c23e5a52bc9a030f2376dbd6a8c689e4e38ee99faae3ef4cc
font_01_sfnt_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 15400 bytes
SHA-256: 1f58f05c917587c491fa72cca5fe9a3264d39d22b8099c08748ae0f3f9741714
font_02_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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