Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e345c28af29e49a…

MALICIOUS

PDF

91.8 KB Created: 2021-08-02 10:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9df358075a804003284b12b624f4ae05 SHA-1: 489e6601ea91eae1aa754565ae63c7170b65275b SHA-256: 9e345c28af29e49ac0e4a6bf8d2c65fd0587024e4f950fc02c694d864081a10f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable hosting, with numerous links pointing to potentially malicious PDFs. The primary attack pattern involves tricking users into visiting these links, which likely serve as a gateway for further infection or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://southwestlooms.com/admin/userfiles/files/44406743177.pdf In PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/m1tqb9llhuc7kkknbj9hj491ce/jafegubi.pdfIn PDF document text
    • https://projetovm.com/uploads/files/24963081551.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/vc7hthnnra2msp1otjrgmvr437/41533382610.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/komibipegaxaliwokarewe.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/90665295099.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/jazisegu.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/suvidelese.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/88336436460.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a56107d86cf82127b32fc8ed66108e64/buzojejademenazaji.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/57900466125.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609335d67fb61---65573114084.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/mugulapuriruforu.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/47889342601.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c4ac9709857529b9577116609cfe00f6/778626510.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/viretefewegadaragapopobo.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99027642185.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6316bdbaa---savitomegelufetagujovon.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/39190423906.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/nexewedetanopigu.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/9nv78gi010aa9hrpqnq4g9ja5a/nafudatorimenud.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/gupigimafikapemobap.pdfIn PDF document text
    • http://aqcons.vn/upload/files/68115252545.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/maide3kf8rhul0192vup1u8g27/potijofexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+kind+of+birds+does+goliath+birdeater+eatPDF 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_off0001036a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036A 10860 bytes
SHA-256: 2713cfd9f4addb328e84b6e0cf15205813520f640a552e26fbd5a02fe7159574
font_01_sfnt_off00011c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 17364 bytes
SHA-256: ff74a08993439fb1b988da0d2466ef3f52d298060c37e5b314d256a2e17a441e
font_02_sfnt_off00014923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1