Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59813c1ecfc6de9…

MALICIOUS

PDF

88.2 KB Created: 2021-10-14 00:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ccf16f8e149b45dceb0367bf709e112a SHA-1: 17e8e0491d2d57299972c1ea4536e5cd35235e33 SHA-256: f59813c1ecfc6de976dae73643b806d37678890d5e257f5951c53489d7ccf9d4
172 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of multiple links pointing to potentially compromised CMS upload directories and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download server. The ML_NYX_PDF_MALICIOUS heuristic and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://familie-schiecke.de/images/file/zetifijatuwelaxesim.pdf In PDF document text
    • http://mobiliteit.nu/files/mefomizojasafajabik.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/12156045519.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/gofagoniteranez.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/62910398011.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/palejesavasiparolexuton.pdfIn PDF document text
    • http://bjjiffy.com/upload/ropopuji.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/97640700028.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/jofaw.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/2179505404.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/sokisesigitumam.pdfIn PDF document text
    • http://podarox.ru/public/files/deverodoromotumusatadigo.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/7a994214981bdb39e5f945e0ecf51bc2/94971897895.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615d4161aa18d---zulusasinebejogifisato.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/zugitunipifeguwoto.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/kaxanopazoga.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/94677475056.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/zedoz.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16164edca30b50---vosivup.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/sakerizi.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/witewakuwimulojirudupatip.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/86633730627.pdfIn PDF document text
    • http://medicareclinichowrah.net/faboriginelist-braj/userfiles/file/lawaxetek.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f8b40f618f48afd34b98650041be1509/disotatukapok.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/noxejekotowuxo.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/xowemotogusodanusar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/UsNeCLCzgYg/uplcv?utm_term=how+many+years+does+a+chicken+livePDF 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_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 19436 bytes
SHA-256: 5bdc923bf4ca40d47c8d7fba25747a502037b3937400f4576a91bd4b23c1d4e6
font_01_sfnt_off000121c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DC 10884 bytes
SHA-256: 8c24e8addb13e75c5f5d10c25474484876ceaaa2533652f109fd9e625410e4e7

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