Malicious PDF — malware analysis report

Static analysis result for SHA-256 a107e202f15f4228…

MALICIOUS

PDF

75.6 KB Created: 2021-08-09 06:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 177616be2c75afefc8c7d4b944731bf4 SHA-1: ba79b61f03ab45d62b9b7b0049c3fa65ccf45520 SHA-256: a107e202f15f4228b17a0c3bd21bb7603eb778769b77727d890565db24f644f3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of external URIs and link farm characteristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=pronoms+possessifs+exercices+fran%C3%A7ais PDF link annotation
    • http://ltptech.vn/uploads/userfiles/file/65640535598.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/2b57bcb5490e0e712a897bb45b957933/basexabiligazojenabomu.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/viviwekebi.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/fowazobojuro.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/5l8afenadi6jo0lts2vhr7rct4/xiwubaja.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b89ef7c476---69148823849.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/popebijumut.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609940064cdc2---lefagonowulozogibupepuxoz.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e0a1f3dec---36179333337.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d63b10e7c4---84013681975.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6dfad6687---duminirepizixegatusafa.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/17580475983.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5252f0a50---webejamepodika.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/82e2371b80090925546c5e99c1fa296f/xuwarebodijawonaxukige.pdfIn PDF document text
    • http://skncn.com/u/files/gefodapewamusofosisuro.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8b2167d9e5bbd6b4495183b8535450a2/vagutarufi.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/39679265969.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/01a275a268dc82013c2951604380d13b/kirabedovozubipekoro.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ab9098452b7c8087c5867a702f94e3c8/maxukumikiwowepaxepu.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/xaragil.pdfIn PDF document text
    • https://airbays.com/userfiles/file/bigakozobobavirajaneduk.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c12c5be3982---21063885097.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e87b936eb10412e226acf7db4455c6c6/13518091087.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_off0000c13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13B 10800 bytes
SHA-256: f75fb365d0c0cb411c1926b0a34e8d3987601ea9d89b7363db985c4ad276b6b8
font_01_sfnt_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 17860 bytes
SHA-256: bb36cf7cd4aa6f11b54e96e0e65a8ab349ac448f1e2d2be010a4854c81f4c3b8
font_02_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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