Malicious PDF — malware analysis report

Static analysis result for SHA-256 df326b8384eda926…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 02:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8013e038713976724c97a185be70636 SHA-1: 453021e5bd6600f9753ad4af2307111c00ed045d SHA-256: df326b8384eda926056a35ac2f1ad29824be1ae020fe2730a05eac0c50b02151
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://adance0112.com/upfile/editor/file/96046779685.pdf In PDF document text
    • http://pegastelco.com/pictures/files/89601914184.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/doterixamonura.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/golasefabedizigoju.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/gipiwajo.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/wogedejupodegesutaseloro.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/23575565941.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/ratow.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/57801459876.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/wemisakotutumud.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/20809405291.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/81576582442.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135984fa3e14---guxefuzimimokiwawuwilabe.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/83110285065.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613369a55a9a7---galironoxediwowupiwepo.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/5432478847.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/75887003537.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/fcf0a1d97765f37591f069e960cb36a4/ruzak.pdfIn PDF document text
    • https://rotitelor.com/contents/files/42262885721.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/84925059107.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/66e64e46c9139677df3b7546773eba1c/71634949391.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/21557910084.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/40625051713.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/ledafusuluzurifegix.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210904_224522_8339.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ed4b77579---37317361836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=floating+widget+androidPDF 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_off0000cfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC8 10320 bytes
SHA-256: 59d22e3bd0925cab125a1f588fc389b352a3c6d801563412cb42099723d1daeb
font_01_sfnt_off0000e6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 16864 bytes
SHA-256: 6a552c9c0715b3d37da274d75073dd964e2e450e51fd3013682fc3a238776a92

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