Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c717068c86a77d6…

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 23:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: efd8dc5ce00d178910d917ebca91c052 SHA-1: 5f3d4f089210db1ff26a207d8b9c167b100adc0e SHA-256: 8c717068c86a77d635a2e65f4db3005b98a47f8015787be6ff1d6aafa1f6a0d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as Pdf.Phishing.Trojan. The embedded JavaScript stream and numerous external URIs suggest an attempt to redirect the user to malicious websites, likely for phishing or to download further malware. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall heuristic profile strongly indicate a malicious intent to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=nomen+verben+verbindung+pdf PDF link annotation
    • https://n-v-v.dk/userfiles/file/85144963377.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/b21e75955ad8659501198392add6aba4/12389011972.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/70886107818.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/99251500760.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161112328c14a4---49753166467.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/18174096595.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e2a42864---13622199153.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae57680f164---fewokisegilej.pdfIn PDF document text
    • http://siembra.me/uploads/files/66734647142.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/44719233540.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e722d5894cf2aebcb0500d86b0886786/92061361020.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c65db22d400971058d9c6c486c5ad564/75438105196.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/94c260f03282cd7b19515154e024a544/kenisebodalukibemego.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4df71ced4---logejeko.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/5q4sm3rpgh1n9qqq8m4csg3gh4/bejuvusibopofobaxirolezu.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/50685061650.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/49917193060.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/sizarurupiwukatagifo.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/61242990176.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/77020993559.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/vokugemudaf.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf196519a1---48297912219.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf155bc93---89791580677.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/e1g7s6f1fgk6mtk42jtsca8mq7/gekibosavagoxagu.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/nagowesejivaxos.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_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 10652 bytes
SHA-256: f9065f6f209160964e0337a48e204e0ee414de75c28c2006428737c53edba43e
font_02_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 20472 bytes
SHA-256: eb4ac2f936cf036bd0a635d642aa207a3aaa1fa76013876270f4def1f5cb75c4

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