Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a09ec75b9a4902…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 05:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ab3e6c6f09bf74dc8217a5a5cd9bbd5 SHA-1: 80ca8b7f513a93ad7c92a92d2a4724d9787a5c5b SHA-256: 33a09ec75b9a49023678dabf8ac0167c84986a54ffd9c58e20d343fc7709a110
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm used for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous URLs point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=template+powerpoint+android PDF link annotation
    • http://rewitex.pl/userfiles/file/vogikekesufa.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/vegute.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/48608697361.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/65955111940.pdfIn PDF document text
    • https://isosklo.cz/uploads/filikelop.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/xixozaku.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/sunevusezafitisebevuv.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/bagenusexenukokutupota.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ba9deb811e5794c9f11e10172796c2d2/86984794117.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/51215049311.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/16611716241.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/dagenog.pdfIn PDF document text
    • http://www.polni.si/Images/files/55531516336.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/9378838438.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/65829479086.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f02487602---3106932690.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/wejoxiwunuz.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/kujilozasejubopeziba.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2p86ekq80g6tke0p4koemp0hev/xaxevifazakogatake.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/65699822016.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/65885022808.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/73781880877.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/nigezopifodatejazas.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_off0000d762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 17808 bytes
SHA-256: 6363c238288d51d48e202dfaeff56cf5dbc2dde350007325f474238352d6088c
font_01_sfnt_off00010604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1B 10432 bytes
SHA-256: 5e5840d22bb2e0fa1136e7d935fb845c34f19a29fc92cf6dccc3afaa175ccd91