Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d53e8bd4468b285…

MALICIOUS

PDF

95.4 KB Created: 2021-09-17 03:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3f207a1e13327a377fc62e47e6c1ab5 SHA-1: a47d72728324e0a2f67f1a1c8b74df4df8e4f0bf SHA-256: 4d53e8bd4468b285c9929ecff44cc37ba546e5074b36885e24de9ab784884a02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://synerhu.ru/uplcv?utm_term=android+handler+send+message+with+data PDF link annotation
    • http://theclelandgroup.com/img/upload/file/lemogiboletenifitotuk.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/monimixavolu.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/79710873585.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/lotamifavegufet.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/4561fd6399006c77b527104c3e7f1d9b/73726175641.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76748114088.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/47753236525.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/jebopokipadoboregi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4f86ea151---47759033978.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/90661321577.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/kiluraregupabejo.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/dopiketuxenodomofupituvu.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/wizamemugokewodizevi.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/sotufalujirisaniredimusoj.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/nijovusofijinela.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/mifemo.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/4088833188.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/37338024852.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137c5ff23e07---zapazafuxi.pdfIn PDF document text
    • http://erdbau-rauch.at/fagusixol.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/tojesevodixulebakadow.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/nuturexelal.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68766662248.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/vaturagubewuxorupafevazer.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/zolexagawaxudime.pdfIn PDF document text
    • https://ivanamihic.com/files/61166176065.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_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 10760 bytes
SHA-256: 6eb50855da21675f3f1523111211e2a6cb9f5c40d46f095a860d81cba1a93cad
font_01_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 18692 bytes
SHA-256: ec51af737839687ac29a02c4bb46572319ad2baa3952886a5fdc7bc340bc41f0
font_02_sfnt_off000157b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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