Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c538114d650e39a…

MALICIOUS

PDF

70.6 KB Created: 2021-08-04 07:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8fe440327984aee63dcc95ec02fee7b3 SHA-1: 337a7b8c8c9e291614d1afbc9d39eb2693713157 SHA-256: 7c538114d650e39a6b9c69ea76406dbd7b7923008f5d224fd2f22525335c1f4f
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, several of which are identified as potentially compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings and URL analysis are sufficient to determine its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8414

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://primaneighbors.com/userimages/13295435374.pdf In PDF document text
    • http://indagosrl.it/userfiles/files/72925937956.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091091a6c3c7---modijinisemagosukuwig.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5101f774e54dc32b05546c1c711a2f41/vedodunugizefesubozugopa.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/bewataji.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/6jrjr3d1f4ksr24edor8hca0ck/xesekozov.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/14881512685.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3910336c6b---59006099180.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zomosejimotuwirurexu.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/51656056277.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/53001624219.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/77638194281.pdfIn PDF document text
    • http://www.moyekolodin.com/files/gelesafijuxonoga.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/mexasotubesele.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/a6adce7f62948bb4ae7179b16878ef5f/88215242344.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070313541139.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210803081927.pdfIn PDF document text
    • https://robertbah.si/files/file/5313062449.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0dc824df---94050131566.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/nutakefisogelewune.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/91245803206.pdfIn PDF document text
    • https://mszukam.pl/dat//file/pivimig.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/9bddb88ab44d5bd33b36ae617bf40c76/55387396390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=math%C3%A9matiques+cm2+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_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 16100 bytes
SHA-256: 6b54a3f50d1a413a5c8c0ed289a9c866e37e8bd73df0b162fe7132700ce54c18

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