Malicious PDF — malware analysis report

Static analysis result for SHA-256 e29dce47d1d9d2dc…

MALICIOUS

PDF

84.1 KB Created: 2021-08-24 17:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fb58092bc492b287231ada9c8af1839 SHA-1: 820be71d93ad4891dec4adabce266586fa9222d2 SHA-256: e29dce47d1d9d2dc4d80cf8685ac72e049dc58b34f628f930408e97a596fc93c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The presence of embedded URLs and the structure of the PDF suggest an attempt to distribute malware through these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ambulatorioveterinariosantanna.eu/userfiles/files/rirubuwakalebipujudax.pdf In PDF document text
    • http://geyikkimya.com/userfiles/upload/file/bubojo.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/sozoxubosaronoralatuduwa.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075aac90da9a---ratesaradimobukosodibavod.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b35a0101196---96433578658.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad0ebc4c78---furexonanikititeti.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/70386950322.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/1678285180.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/84330763029.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/or1om4h8erscv8s7p9sbpr9bp2/38358194086.pdfIn PDF document text
    • http://one9five.com/userfiles/files/suvazixixefemula.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/081vqhgjb1rg4b7p7nduuv8pn0/wanivujanevepix.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608478cf0a55a---91283095530.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/rudededadavotimidefida.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/j5kteke9uard4vao998faotsqu/41001342348.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/mijufe.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a598b9fd56---43265305004.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/42993361372.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/23338868610.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/bf5b8c00830b355f28209396c70b9a66/21628432226.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/3k4572rqh6ofqtbf8jem0ifogo/nawomedumu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/p0cvd4q6l4um0lubg72iek1oj5/41514794875.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb7eb3bb7---69870892334.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/43677404461.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/51607964351.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/75bb9bad82600f5d6662bb049d29e31e/nozaratibiveji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+salt+results+from+the+neutralization+of+calcium+hydroxide+by+hydrobromic+acidPDF 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_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 16544 bytes
SHA-256: 36c5ae7f933de6ac0e3a0c174f2543dfc49e2e1d2ddceeb19844f7cd558e7fc0
font_01_sfnt_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 11252 bytes
SHA-256: 4c6afd87900c47419aeee677ffe2ff79d7d4bbabe3e94ce458709d3f7821e431

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