Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1c37465adc741e…

MALICIOUS

PDF

78.4 KB Created: 2021-09-01 06:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a22544e6bbe0101f7ed9f531ea7e283 SHA-1: 6b12c9263ee1c743300e492f4809fd48f83e0341 SHA-256: aa1c37465adc741e1587df352db997a41d1d514e101ab04ad30adbf845afbda8
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, directing users to compromised WordPress sites and disposable hosting domains. The embedded URLs, such as the one pointing to a compromised CMS upload, are strong indicators of malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ojit9eme9l1v0abj52anqcu3r4/remapaximipugune.pdf In PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/15759472442.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/turotoserawirofapefeweb.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e618d40a51d---tijumojosekedufizude.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/vj3sgegnfldahh6pmdoa2r7m40/49412720224.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f4821e42b7856f0b46362ac3c0fb886c/xafufujara.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/39820961797.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/18824178545.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/lanidirigepusag.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/bugizizinoluvaguwem.pdfIn PDF document text
    • https://ayurmitra.com/files/file/saxowabeb.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/22529215027.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/92184686270.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fd4abe88c---90428194817.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/46541425320.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/zozekajeted.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/tizotite.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/gaditewevotojasubu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/24f7d992dba533c814bf2aeb51371725/85808545753.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d2c2b61bad2d92d460e48d6620cee824/gimolepadi.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ac409cd3e99---joretevotuvofulilunewove.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/57710019350.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f73f42653---molunifipo.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/83103392095.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/54332880320.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021072013590238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+teams+in+coin+masterPDF 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_off0000cf05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF05 10604 bytes
SHA-256: cb749f373a34bc26e2f74a0abc1f457bbe60a8575fa39f2d6636faf51aeda3b0
font_01_sfnt_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 17164 bytes
SHA-256: c7d31ed5e35ffcbd791791e0a10e20c70d614f5b653e8f801aaa30905b8b9c84

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