Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69c6eaf56b98672…

MALICIOUS

PDF

86.5 KB Created: 2021-09-20 13:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d8c6a98aba3b49ec69ef6a2b53ecfd1 SHA-1: 5d7a4af94413a319d583430380f890d6374d9893 SHA-256: c69c6eaf56b98672c2388a16965cf74f6658094847c61a5b763af04832ab29ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, likely intended to trick users into downloading further malware. The presence of embedded URLs and the nature of the heuristics suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inprovitargentina.com/ckfinder/userfiles/files/maluvoxogefijav.pdf In PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/90704697179.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/03dd4c2c92328a92d4b02009d8258559/70652948035.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/66904235877.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325af07de31---66453186585.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8e6861cf08cce47c602b2024719b0dd6/35396964057.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/xizuto.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/46329879885.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/wefuxixoniratulon.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/9599835695.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/68564743289.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/mumefikudosa.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/zapasepidonale.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/26431071628.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/gobevi.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/58061325954.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/40341627873.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/jivebilobowobiguge.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pg5djqlose9scb365m1gnncsd7/wewugerosexo.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/luzugi.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210916_174804.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/livosisekemu.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-12/20210912192958302219.pdfIn PDF document text
    • https://socardan.com/userfiles/files/mixaruvuwuzuponifopufef.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/9353222126.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16141701dcff6c---97168249482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=honeycam+mod+apkPDF 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_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 19588 bytes
SHA-256: e5dbd35b222ba639ab2623f89aa2455d780c79c58e7aa4f6bfa40bc7f8ab19ad
font_01_sfnt_off00011cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E7 10368 bytes
SHA-256: 948ee1ca579af3b4db85053370ffbc04024925cfb1504112cd37b18357037561

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