Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3cdaef2e7cb093…

MALICIOUS

PDF

70.8 KB Created: 2021-09-04 07:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4e39b74993882d9198fc40130965f66 SHA-1: 35c342e095fe4b374ee28b141ff6553a66051821 SHA-256: bc3cdaef2e7cb0938f5f78c5028dbea26b21a3ee70c3c1e434ff0e7c481b13ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The numerous embedded URLs point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://crysiq.ru/uplcv?utm_term=cariotipo+fish+pdf PDF link annotation
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083093f9f554---39370323527.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/12664230503.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd7cc6d48---levakebenezowoduwekulaz.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160dc4f0ad3f2f---gipegetapelabarej.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/64a10b4dbf980ce6ff87a869216d93c9/98427557206.pdfIn PDF document text
    • http://bdn10.cz/files/file/jivinamilozugulira.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102d3e913055---24812068561.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/putawanikemifowexebe.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/94266008631.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/b64a95c81b0a062a6277d109b8d14e51/leboludejokerarizojirum.pdfIn PDF document text
    • http://mfdesign.hu/files/file/lolurigegawozisowira.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6929caef5---vilolefiwebowu.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/bupufexosi.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/xenujajerat.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161130ee3df1d0---18655856702.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2da435da7f---wenop.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/00eeb8cd55c047efe4470ddce141ad62/318332309.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/536300dfeb85c2f4d6295a10e21bc99f/jupekag.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/biwiluburukimiwajojiler.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071ffb16b4ff---datanujovufu.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/45124812921.pdfIn PDF document text
    • http://bptramptour.pl/files/file/15086513093.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/76008171575.pdfIn PDF document text
    • 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_off0000b77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8F 15344 bytes
SHA-256: 58ea9c6056cccad61aa11f7be0faa0c91a348c82bbfb5ad019b39e67772c5c0a
font_02_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 10344 bytes
SHA-256: 3c7fb6d27b07a6b3a63e758d1dcb933e14e5b165279475dbf1a63a1806e2125b

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