Malicious PDF — malware analysis report

Static analysis result for SHA-256 812d9805a1ddb1b3…

MALICIOUS

PDF

84.3 KB Created: 2021-09-11 14:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a5501ba0b10987e026d8d432e5c1972 SHA-1: 50f493de0aa54562f48c5b798c2d31a01542cdea SHA-256: 812d9805a1ddb1b3f921468b5b08eff48ef15a52a1c3f14213cafeae42f7b65f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, 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 PDF structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://audit-advisers.com/userfiles/file/jawulurojoneses.pdf In PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/71737640635.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/14758559243.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/1340468161.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/30782684362.pdfIn PDF document text
    • http://rivucota.com/upload/files/35563727619.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/61313810660.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/beverapakerimumujexexe.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/leburufapejojujigazebe.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/14022735345.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/15829235685.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1c30169415d209bac3fa5f95d41a398f/31416440707.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/sakigodug.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/50447947559.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161369106e8c29---22769998783.pdfIn PDF document text
    • http://hk-keber.de/images/file/75340672119.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/74746500386.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/19496336922.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/20854285650.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b747105d05---gezawilozivok.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210905_843433E7A9A1D436.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/38073772346.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/56133585210.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109101823472803.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/67210916846.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/pujanajisadajujufepexo.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/222451185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=alldocube+x+neo+updatePDF 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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 18344 bytes
SHA-256: bd4c16db7937a3bf45de6b9a8ac49e091e2836d70c4a26a1d5f4467a0c64189a
font_01_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1A 10468 bytes
SHA-256: 79dc814512e05b6af6063ad5ec2eebd49d0f3c228723f839b471067893d134d5