Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b857f83f8762e5…

MALICIOUS

PDF

64.0 KB Created: 2021-09-06 20:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e0ba9bfd1cf2de4828c032bb2da03e9d SHA-1: b82d37834f0f75db11991c78391c29f7a210342e SHA-256: b9b857f83f8762e54aeb5abef67757fb8df01a38e0df5f27e052ef4da448b0a7
154 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous heuristics identified it as a link farm pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7793

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://chongthamphucthang.com/images/news/files/53679364902.pdf In PDF document text
    • http://bayanairag.com/uploads/userfiles/files/59916359146.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/86109518103.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/74umns19ok35u9cnhvh9igbtpo/nifabiputoto.pdfIn PDF document text
    • https://denimder.org/resimler/files/nedizedaku.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/jebatado.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/begogepuxuwaluz.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7shvsg2j3dravmnbho0dferugj/gufipujowipetamiros.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/mijejiwamuzededatapimob.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d8ea56b398---dozakojagimime.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/tokosoremijeroso.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/lalopixixulo.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/18117308563.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b3012ca680bb3178245800ba0deb64a6/firarodifapaxilugozegalab.pdfIn PDF document text
    • https://quangcaoxetaxi.vn/upload/fck/file/61685529487.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/mekenelo.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c87c052040---gamimipaxikiwisalufobi.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/rejijajamabalafewukiko.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/2038122727.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105052004568498.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086481225340---nodobepijowosipumuke.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02e7c5ea3---wusuwuzumadawa.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/25233993972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=2+storey+residential+house+complete+plan+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C5 18568 bytes
SHA-256: bba3a79e1c9578c32d3dc9f37e9fe733c424e91c2cbd269e0843438730970fe6

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