Malicious PDF — malware analysis report

Static analysis result for SHA-256 349e30605ded1adb…

MALICIOUS

PDF

81.1 KB Created: 2021-07-20 05:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 157f8b2716f46467d896de68c88af5c0 SHA-1: 51e9bd08b262b7c288cc1740dc6303bc65348a65 SHA-256: 349e30605ded1adbcbb338edc3dceb544f792808aaa8c8cf9041de4462901dbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially engage in SEO manipulation for malicious purposes. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3396

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/mqjntredab8ht78tkbhkbgtvth/kufuvuturuxavedufegi.pdf In PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/3acc10e7f66e4e20a3c71607fc7d9168/38986545397.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3e83d5b8c---77394967300.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/nogifogobakasemewotisele.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b894665950d---jafasulapekuj.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021072007121373499.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/j3sifko4fp5c9mahi1m8i2bkg7/sibavojezunewotisa.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/af314198f5d05715677757a2f04b6118/86974389072.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/92717298880.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/aed536cea69a07ccce408407c3ccdbf4/pamugupiba.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/v183njqre6spkpg3ekq1kv3vh2/xifenerujelepefotadofe.pdfIn PDF document text
    • http://prestopc.it/upload/file/kumojakagopajogutaxew.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/zekexino.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/laxotukija.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6faff7d848---61137843915.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/mamubazafu.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/xujikerolamabu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160874695cc1a6---toreluj.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac602b7ae29---sejefadamurabuxi.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160da907af381a---42585389617.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085deaf483ab.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/nonulorejijanilumavutoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=number+one+china+ewingPDF link annotation
    • 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_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECA 10668 bytes
SHA-256: d21d53bf528ea70f4a392edb1475f1730b7cbebe868257465be52cac49834ff0
font_02_sfnt_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 17756 bytes
SHA-256: 3a6ca896d17fc0e01876f490cace32c4681609e510ee4cb7815990fadc059fbe

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