Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a8421b799fdd42…

MALICIOUS

PDF

86.8 KB Created: 2021-08-06 01:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da76b421cb23e63ebb8d32a694cd4336 SHA-1: 62b564c56a7a080c2632b0cb08388d1bac006dcc SHA-256: 12a8421b799fdd424cdec38f391b98ec49b4832aa0ea7aab1c2e540c1b474b96
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://charivne.info/images/file/48547358338.pdf In PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4d2358a574c80cdde0d34a0f27a20a85/20626774594.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098be7abff6f---46492795481.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210601043629.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/refevotiwurodozasil.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/4t723ahqmdeh0uunvcp36sdru0/69005648930.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/gojefolivomago.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0dad7049e---18763906873.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/lijikoposi.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/gojadalugil.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/6201ffc0455ab0ba1d8e4d073eba8b05/mukodoxu.pdfIn PDF document text
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/piwinurusiwimekemakene.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf8a3a20d---totuloxajonime.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076431014fe4---45626166439.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/59398048750.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/kuvegam.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/vefadarobakaxi.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe3f9704dc---kutubamorabaro.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/borekenubibefepabife.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/31070799330.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/23014688479.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/xavusuvipekikele.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/tojofidadu.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8ceb2d06faa77808b7c202dd8a2fd5d8/89435973618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+drill+size+for+1%2F4+tapPDF 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_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 10708 bytes
SHA-256: 73d1cb0b25f694bcd031efe428911d0f66849f612b6f8cde8bcd1f09e89a07a1
font_02_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 16884 bytes
SHA-256: 7c31051fd5277906f3f295557814a2e08ce9a065474dddb319fa287efada5d92