Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae08c1aa8fdd045…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 11:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e5bfe0417d928363cedd66a78ea0907b SHA-1: 81159fe71f33d17cb187df69c3da51d7a5d0d05f SHA-256: 1ae08c1aa8fdd0451065e1bfceb3575cb63489ed05c4db91e5992d7d192fffbc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://profitoolinfo.ru/ckfinder/userfiles/files/zujetuvaboruwogopo.pdf In PDF document text
    • https://mamotato.ro/userfiles/file/2885182233.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/93816521527.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/90crlp960raucbsrflgpihe20h/79634936352.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/18081335950.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/99096801761.pdfIn PDF document text
    • http://ihdbd.org/upload/files/84671498446.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/zopig.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/28869621301.pdfIn PDF document text
    • http://innotack.com/userfiles/files/75070538073.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/vosazuradebefitag.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/52188719076.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/nofonesanowus.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/5742870973.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/95458816474.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/35021656110.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/penopimegabexar.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/lv8rcnmko5rsoof1ciku86hjk5/25674764936.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/30418226664.pdfIn PDF document text
    • http://e-sheremet.com/img/6406079532.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/xipef.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/37446533482.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136170bd6a13---83701872289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=moto+g9+power+rootPDF 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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 10100 bytes
SHA-256: dbcec0998c75051a82419b7ea19cdc45b2d1744aebce204f49c986937bf146c5
font_02_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 17280 bytes
SHA-256: 4e3138cee0c25f7345555305b24a48640c2e548194bcde7690a4a554278ceb07