Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c7106369a67e64…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 18:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e2d176389ef0530a1065202eccfb5dc SHA-1: ca7460d64a4f9b22308ff0092f3cada9d7498541 SHA-256: e1c7106369a67e645cb7e0ea313c9fca24c9e2d1e6d612595bedb544d4615179
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of embedded JavaScript (T1059.007) and the nature of the links strongly suggest a phishing or malware distribution campaign, likely delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://serextion2006.com/js/upload/files/75783507097.pdf In PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/ginokiwibatorafu.pdfIn PDF document text
    • http://webursitet.org/Files/file/tebejuliwizibo.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/44862711757.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/49353182327.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/98639922221.pdfIn PDF document text
    • https://el-tall.pl/pics/file/18390406010.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/todajavip.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/vejiteraxis.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/wegodunu.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/ponorebix.pdfIn PDF document text
    • https://phukienbep.net/media/files/43838497306.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/98914200723.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/gelotiva.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/73858911958.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/xomakukexonutilaf.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614590e0c983d---60870853443.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/runowarimifewisi.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/0dc00e7fa85fc5204d8811d99563d175/62383319664.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210912210428_666119369.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/ferejunenafozibovajinajo.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/27295339661.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/gomiw.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ab670af617af32538fecdbd55b764220/kaxofajevixugusolude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ios+theme+android+tabletPDF 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_off0000babb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABB 10604 bytes
SHA-256: 41819f730ab2b5daa446155de710e499c422759204801477e9b254b97fc67f37
font_01_sfnt_off0000d2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 17192 bytes
SHA-256: f90a95942ed953fd13f6fb99bf3a840a0a910dd83b818eca1a9a396af3122187

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