Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d34efc77d4cf23…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 08:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e09d74e0beb454ef9b2975b748f9331d SHA-1: 340b8fcefba1d126bb4a4bf1a109abe7094d967a SHA-256: e3d34efc77d4cf2318474d8fa8da26b81dee30c1a0e2dc0b588b460f40d8e3ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=schaum%27s+outline+of+optics+pdf PDF link annotation
    • http://guchen.ru/d/files/bewefexizufugiti.pdfIn PDF document text
    • http://carbonelite.ru/file/volozef.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/s6oc61c295o7gekta7hd81gn2t/29744962806.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/20563719346.pdfIn PDF document text
    • https://curvy.tw/upload/files/56199069905.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/vubakezo.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/77504800560.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/62772935143.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161362f1ae4dd6---36229814547.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161313f2be1b59---25347513913.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/xuzegim.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/42429921042.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/57302586523.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/girujikaxusonelilumenid.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/lofuwatimiwe.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/vuragadijex.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/vavewewupi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/s001lp4hickec1c758u0nb9ol3/66819512995.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137be90cdfaf---nuxituzepolibuxapef.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/86021713965.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/41658825410.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/6427552188.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/51921966586.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/gefiririxotavuweduto.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/4417624416.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/vefumupokufo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xeriloka.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d16e2942f---geduloputoxida.pdfIn PDF document text
    • 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_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 16912 bytes
SHA-256: 4197926c815480a7a49896090a4c4a90888a772bb6a9daf403879d91f7bee9fa
font_01_sfnt_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 10992 bytes
SHA-256: 6edea8c061e525d6b75c56f254820b89f5077c605f772a768df4392a0ccfcf61
font_02_sfnt_off00011b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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