Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a3f51a978c8735…

MALICIOUS

PDF

81.8 KB Created: 2021-09-24 02:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dba556705068bed5aa6769a62e33c340 SHA-1: 53ad6fbda5333016cf2ce7b403fde79897ec9afe SHA-256: e3a3f51a978c8735dafd8ca720f57f035b571814ca20acbd64a22d0148e37e35
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The primary goal appears to be redirecting users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://balticstroy.com/uploads/files/xekoxatagumupumajabal.pdf In PDF document text
    • http://www.lbtfilm.com/uploads/files/gajojutewonidaviw.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/pakawa.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/zoxokududegolituvolu.pdfIn PDF document text
    • http://budropol.de/Upload/file/11698923720.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/kajawogotiri.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/ganik.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/rotamozenazuwokale.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/nudamigedibufevikojenol.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/verobumexeseruzuropefif.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109100510502278.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/98037910103.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb7d8386f---gopode.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/96495307332.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/38812973346.pdfIn PDF document text
    • http://villkasz.hu/editor_up/45171663694.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614458279936a---xomovuniximutivilofi.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/sapukixapigabukudaxiwoge.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613246bb3b13b---83801033336.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/binapirevotodazikow.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614a4063e6f56---60250310505.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/zomumupeni.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/79270920924.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614be598c4ff2---80776099013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=redmi+note+9+and+10+comparisonPDF 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_off0000d387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD387 19720 bytes
SHA-256: 5313abb561f3e2a879d42bbd4116db0c72ccffad59d389eb12726834bb40ee2c
font_01_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F98 11016 bytes
SHA-256: 0b15207b31861e69181d90ac34b720186871f78e365aa693063a1d7aa02f1a30

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