Malicious PDF — malware analysis report

Static analysis result for SHA-256 e298853423b936b8…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 00:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59f976bcf676ebb8014a4a502bf41f85 SHA-1: d819e89201792ac6f906ea1bb8fc80048f91c844 SHA-256: e298853423b936b83ef0a3569c29a53454ad7f630c878521ae7db0d4dfa35c2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to various domains, many of which are hosted on disposable or compromised hosting, suggesting a link farm or phishing campaign. The presence of external URIs and link farms strongly suggests an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://usairsprings.com/userfiles/file/44296299594.pdf
    • http://sns.hu/_user/file/monetikixipexiko.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3d0033ce0---wibijojunubizugonaf.pdf
    • https://parkettworld.com/upload/files/vafebupeluvolizuduv.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/81198272465.pdf
    • http://zdrowejaja.com/Upload/file/22815356530.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131829294f68---vomipesedupetulukidej.pdf
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/9391182281.pdf
    • http://centromp.it/userfiles/files/xifofafajeref.pdf
    • http://talleresjpg.es/img/file/92342791811.pdf
    • http://likuidart.com/files/ckeditor/files/xudejikejowalobo.pdf
    • https://securitydm.net/slicice/file/wiveguwud.pdf
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/rukitosota.pdf
    • http://kgmda.com/upload/files/weruwadigidudowax.pdf
    • http://1carl.com/userfiles/file/gugezifupikopa.pdf
    • https://sssmri.com/ckfinder/userfiles/files/vuforasagawojunedi.pdf
    • http://etpatatietpatata.com/userfiles/files/98059772436.pdf
    • http://2990592.ru/ckfinder/userfiles/files/59022894058.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4343ffb2---46690426286.pdf
    • http://karlsbach.de/userfiles/files/89720597784.pdf
    • http://primaria-ciocirlia.ro/media/file/30995506943.pdf
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/36743025788.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a8a8b326581bfe12d78e6bd0c92d3f68/74056616388.pdf
    • https://luatsubienhoa.com/upload/ck/files/kutifani.pdf
    • https://dabanbep.tanglehadong.com/upload/files/92204678950.pdf
    • http://sakurahoaanhdao.com/webroot/img/files/99825702971.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+print+a+pdf+file+on+mac
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B4 16792 bytes
font_01_sfnt_off0000cdcb.bin
dc048f53c86f40faa0ea9a281ffb26190c1ee184a4a519dd04ca04eaf22c07e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCB 10688 bytes
font_02_sfnt_off0000e644.bin
21691d01a8f23648a3e4011444fa6e4819efbac5e218d56f6ea5ec9cfc16387d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 16732 bytes