Malicious PDF — malware analysis report

Static analysis result for SHA-256 312c0c31a66ac23e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 01:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b5216dc4bfa69702ba6c7257536faf9a SHA-1: 16d06f87f505d03c1a50ddcf8f83f87666479d92 SHA-256: 312c0c31a66ac23ea9072926e96b17172c555e80872fe20e5afd23a00cffc9ea
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://karimeh.com/public/userfiles/file/981175237.pdf In PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d29d5b1a8---64669247330.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/fuvutuz.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/30538064287.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021072218140076.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/82380127394.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5a7aeebaa---vobalisukuvuri.pdfIn PDF document text
    • https://servauto.fr/img/user/file/6130879909.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca12441be---40575591751.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/jubafewezobaro.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b477a2940e88e3ac180e3111cb1f2db9/kafakasaxawipuj.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c53bb57c18c---82052087148.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/3k4d8ootib3bhreau5ns1ov87p/pekajokefanamiwifolaz.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/31945336191.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/41629951635.pdfIn PDF document text
    • https://kopari.hu/files/file/50697878723.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986cb1098d0---notezonakezi.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf50eb25f6---vorujeloguzozi.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/n3v6jsgivnbppqqf531ca13qlc/72588832005.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/woxigen.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/e90ae0e7c2eae1dd48f5f2d936c8d92e/duwewijoluwafazigujefug.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/78469752594.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/63238338484.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1bcd33a773f1a47b2363e46a46d394a2/78073086367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=esl+lesson+about+jobs+pdfPDF 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_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 10652 bytes
SHA-256: 8837b0599c126f99530366a2eaed5f5f1c14379d3c7d6e7c195cd375d92cbabf
font_01_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 17960 bytes
SHA-256: ace138f793c791ed8cf445fdfdb9c4a2c2b157bffc4666df843c4b3a36344946
font_02_sfnt_off00012971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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