Malicious PDF — malware analysis report

Static analysis result for SHA-256 193e9870a86c74a1…

MALICIOUS

PDF

71.3 KB Created: 2021-07-17 05:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e659ea1208d1386b531f01c8777cc982 SHA-1: 4d2a561c097648fb3bdf494457be077b6c05e757 SHA-256: 193e9870a86c74a1e19703490991fd3807d934e842697bff9bb804206c108b1b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or a phishing campaign designed to lead victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b8eec8662---kejegojigilumifad.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b632b27571---gekogorivoburutafibikola.pdf
    • http://trips-in.com/ckupload/files/81237987676.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef045103d---60537786002.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/nju1pgd0popbo7hnul705bpak6/19627468461.pdf
    • http://cn-junsheng.com/upload/file///20217102961567.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5f5d2332a---94367134013.pdf
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/rakewidalusitotatoboj.pdf
    • https://gsacademy.ge/uploads/files/wofikukowodaxunexomojamuv.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/lufutu.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d46b3ca87c---62894087924.pdf
    • http://michellesmithscott.com/clients/36670/File/fakaxesisegevi.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f4af16a585f03df03771cf12461c354f/givafuvukopu.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vu9va9oebm2ridhjapvnhbk7o6/bizopunoxiworofax.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/nuwixegokufikozusanewuni.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b842a103f8c---11243487969.pdf
    • http://epoxidice.ro/mm/file/54318453936.pdf
    • http://topoint.cc/userfiles/fckFile/20210704001524.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db97722787---31186951737.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af58a3bc9f---tarivan.pdf
    • https://billionbosses.com/ckfinder/userfiles/files/midupamesudazusa.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bebe24e72eb395cc21869b441f2b99d5/95010265669.pdf
    • https://michelbarbot.com/upload/files/dabutufagusamiwizevo.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210630/file/16250696802406.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=form+class+bootstrap
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b98e.bin
ebfa73351b206263c72a215d9510b8724945e5fff1e51fb40a3eb89b0316966c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB98E 10324 bytes
font_01_sfnt_off0000d0ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AC 16792 bytes
font_02_sfnt_off0000e8be.bin
738d020cf976f435a107c3aa9be01054d52e42aa967e8c8b1367552652757ec3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 15188 bytes