Malicious PDF — malware analysis report

Static analysis result for SHA-256 418f799ee6b4a2da…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 18:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d14593aeee8ec369e24870d98fecc17a SHA-1: 9c8fa69598458a08a54c1a4d05c5e341f93f9d20 SHA-256: 418f799ee6b4a2da3c57c3093aabde58742a77ee108492c50e7cf81dcb7f1bf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates an attempt to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://irlanc.ru/uplcv?utm_term=acrobat+reader+append+pdf PDF link annotation
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/novozujifufuridewebita.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/jeseroridijepab.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089262a0ed8c---79154187451.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/2a470faf73b123f9eb07572526bed4da/diboxoxituwux.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1h28nr3vofdrv07hs7235kfbk4/vefobepo.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/49759354584.pdfIn PDF document text
    • http://distributoram.com/files/file/vipubolizajibutode.pdfIn PDF document text
    • http://accronline.com/userfiles/file/99173180343.pdfIn PDF document text
    • http://limoride.net/gallery/file/sizoranimokagewizuwufe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c148c694d1b---munosit.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/gumisitabupevofojubopi.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/setopexarorifo.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/taxadofa.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ec42ba2e245---88310513293.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85d9047d8---jevodidefov.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e9289bf3218---lumejojelesiz.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9c9f324a184d260a35a4e4b61d754d4c/86223977127.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a0ehj7s9re00efoodvk4860k10/86365150779.pdfIn PDF document text
    • https://loyd.rs/images/file/golozojenowasugajibobibul.pdfIn PDF document text
    • http://norview63.com/clients/5/59/59ba6e1aa7224642a1eeb14435756cbf/File/koson.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/41176428039.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/efsf5gt18eivbtl1l6o8v0eh0v/87229745859.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/24431242234.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/worenop.pdfIn PDF document text
    • 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_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 17872 bytes
SHA-256: b0870dfad2350859ae4ca985a2ff0ec6da286c69c73e22c52b8fc7fd075d6079
font_02_sfnt_off0001280c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280C 10428 bytes
SHA-256: e97fdd7f7cc04327beb4892d47788b1c258ff958c5fecda4c715cfc79858869e

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