Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb34686a570c4385…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 02:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c2aa09f349d8248d08c1bca853c2477f SHA-1: 5d9e24de5157780440a8a84abcb02f7bf55f4480 SHA-256: eb34686a570c43856d3d8da55be67446872b141c573d2b8c77c3f8de9ebf3b1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading further malicious content. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ctapigroup3.com/contents//files/92723247077.pdf In PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/7g2ovutpmrip6j9cqbd92j0qjf/6131325320.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/27874816371.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/55802846712.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/50082c33bb145da97aced1104a3c7f5b/52528842706.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/rovipelatosasuze.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161291b351c6a5---vikowejakigir.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d1d6f2641---52359839500.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/82814038493.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/wirepenadukalomawol.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210718_47D6896595B70D4C.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/8000866935.pdfIn PDF document text
    • http://intergeored.com/upload/File/rekog.pdfIn PDF document text
    • https://derfo.info/resimler/files/vumoxelape.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/bizagotix.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/75781240372.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/63834923985.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/61799184701.pdfIn PDF document text
    • https://tdfstore.it/file/97656102078.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dd8107435---fodevawabejukumon.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/kakiwuvabuvidi.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089b4726ff45---zolawanawapomifedazet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=apush+period+2+notes+pdfPDF 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_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 18376 bytes
SHA-256: a0437e639c87adfbaf49b06171469d4f96d197b668dc296763936149e29f2088
font_01_sfnt_off00010fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 10588 bytes
SHA-256: 497432b43831bac6dfb47a3942931df034cccc178db68414a7be76fd33dfd3b9
font_02_sfnt_off000127fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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