Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d02534398b9b8f…

MALICIOUS

PDF

88.2 KB Created: 2021-09-17 14:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b8301ccf39f291cb526df73a5a100b5 SHA-1: 79ed1daf2de82a426c69fd3c87c17cfdee30a65f SHA-256: 61d02534398b9b8f110f24a9d817bb41808e1b8041e719035e3e211144c1615c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7ecc92dc9186fae84c129378f1ac6108/6910898003.pdf In PDF document text
    • https://ladymamashop.com/uploads/files/202109140415427470.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/lumavuvemuwasesusatojoja.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/vaxinuwaxexufa.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/pogopeferexededuxujat.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/suxiwi.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/71914074957.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d837c6aadf057205780d9cca22d4d3d7/20526231591.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/23272400812.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/dibodenotaduvobaropifirov.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613548a2269e0---tovagevokow.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161436db32086f---61317583688.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144430a4ad25---purinepadixu.pdfIn PDF document text
    • http://gensugroup.com/upload/files/katapodofosukukemije.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/72119591143.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/kasaguduw.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/5544606987.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/wivumefakixezej.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/niwasagovanomibebovagili.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/39559671496.pdfIn PDF document text
    • https://la-klamm.org/Files/files/lukapulovaziwovexaxatosa.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/sotovan.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/37246326338.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/20070585313.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/22394209420.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/664151161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=in+the+osi+model+encryption+and+decryption+are+functions+of+thePDF 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_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 18452 bytes
SHA-256: dc2f91d405dbfc961270b3853a13d8e2b566ec26d58da856f7eff384dbc0b1f7
font_01_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 11052 bytes
SHA-256: 73cc42542dc4981a2b40783e97e306d19e776b522ca778f5c0f0398e97ebb75d
font_02_sfnt_off00013ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1