Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb8c0db3649b411…

MALICIOUS

PDF

84.0 KB Created: 2021-07-24 03:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f92b198289ee5516a7facbab8b22cbc SHA-1: 87741442e9cb6524ee7613a3a386383bcddb5c52 SHA-256: efb8c0db3649b4117d978a9e52c1ec2581bb5c12c8c5f16f08aed15c88c94297
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable domains, suggesting a phishing or redirection scheme. The presence of these links and the nature of the hosting indicate an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://biogenetixpharma.com/ci/userfiles/files/99579919072.pdf In PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ba8e2f3c4---lupagowuwiwiza.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd53d8714cc---62824303847.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6fd916440c---39995840300.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078578777588---88496968291.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b109e981dc5---xinogirepekemodub.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c56cf6f9f71ed37076b4611cd79d3839/tewosimumasimepabajunisef.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/vixonajowibavenudelabikam.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/86548743281.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d3v4k31fakrg82h0kcpkaupe73/wosevemaxag.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2145ecefef857911a6b844c5119a6e57/gisot.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a29cb99a397d6ba2ea00761f2dc68618/makabepiwafe.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8f0201554---41867160803.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/61689229776.pdfIn PDF document text
    • http://hhtaitung.com/CKEdit/upload/files/radaniwimesel.pdfIn PDF document text
    • http://langmypham.com/luutru/files/25745731408.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/45455377763.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/minopawotalej.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/41016555424.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/30545602662.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a538402f3df---lofalegolakoxivape.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/latotukuwodidowuga.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/majumedanotow.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021755758242.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8168a71fe5---39795053552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=icao+annex+2+latest+edition+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 16484 bytes
SHA-256: 64794009602ac6320d6f342430cb293439fbf1283c26b0c70b0cabe2bef15953
font_02_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 16540 bytes
SHA-256: 83e9be3187104104a86c5cb0e26a2f0c778a108ee1d7b1cb43a07f2c5db0bba7
font_03_sfnt_off0001284e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284E 10684 bytes
SHA-256: ed8955c0431c45f2c8474c6542f08b1fedde30e726814311b089d661f35eac94

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