Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab34bde7f390805…

MALICIOUS

PDF

96.7 KB Created: 2021-09-21 06:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60c49716eddae59b445008f91a4e3661 SHA-1: 49d098e8583e6801f42aec67a1ce1703bf7aad26 SHA-256: eab34bde7f390805b05256c6597331c005f656bd09a3accbb73af3854ed9475d
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to external sites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and heuristic firings indicate it is designed to redirect users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wingmanplanningdemo.com/userfiles/files/39899425758.pdf In PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/9247487465.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/fetudezojodefudofogoki.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/71660145046.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/bozivebumof.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/52731197925.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/3927879983.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/gigubajalikinotonitebu.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/rozusurevikopibesolevures.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493c22ab80a---bigat.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b8a68693f3b5835a52e6f157d7ef72b9/84834431880.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/ralesoludovaxerubus.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/27275713046.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/68433600419.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/banubo.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/54643112968.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/16819426722.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/8aadb424fa28e0f1e5956590451baa73/39635272996.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/pemewiketuvesiwafulapogig.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/bigusonofapanano.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/vumam.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/renisedewil.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/85785131916.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ded3724f9638a3d4e93d0678baeb7d41/29700072259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=indices+and+surds+worksheetPDF 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_off00011227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3E 10648 bytes
SHA-256: 0a5918f858735a311d277ca342461c153d4c054373077c46095bc8204758e9ec
font_02_sfnt_off000142a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A8 19132 bytes
SHA-256: 2be33fd399337d91153382737f77ee89c83f2fd262e219123e40f374be530880