Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a6e353a003af94…

MALICIOUS

PDF

72.1 KB Created: 2021-09-24 11:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6573b4f63fe8e5aae90212b9b2d41a87 SHA-1: b155e30fd94584efaa3c8bf31e1f85e6be7317bc SHA-256: e7a6e353a003af9474f9476fa5f491838db7320fe6610bb6efbc608c8e8e923a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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=pokemon+sword+and+shield+emulator+download+android PDF link annotation
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b9e0ba6f47084aeff2fdd0eeb3e1945d/5576484446.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/gabavidibalirimokifos.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/keweweva.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/rutalunupokegifopijofe.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/12/file/20210912_144039_148.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/6804491858.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/rizexowexun.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/63064503964.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/86038485580.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/mitexigabukepelavoku.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457040ee7f4---95588025623.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c58ef9c9e2---55136854688.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/78403336068.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161449eb81ea1a---23137684189.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/pidivifuridizowuloxezured.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/43845071045.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/24410627899.pdfIn PDF document text
    • http://langmypham.com/luutru/files/xujiwefuwivevid.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/senikaz.pdfIn PDF document text
    • http://usagimatur.com/files/others/14496644965.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/71067884941.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/guteparidarupizikux.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/45325348305.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/juvufili.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/kujoda.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/fuzazameg.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_off0000b66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66C 10792 bytes
SHA-256: 1e474e2eb68ae79a169e0fca6285beb539998af48e0fbfa10d0353185328411b
font_01_sfnt_off0000cf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 16096 bytes
SHA-256: a04e9c6706a8b18b3791ea5410137e41c6798c89814d9f644baa0bf8f8d51b58

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