Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bb2e2fefd27e52…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 16:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 847f97d969aae4c6bda5674d1537461e SHA-1: bb230e162e730275c15ffc958de1d7a38a14914f SHA-256: a1bb2e2fefd27e528327a68dad3548fe4eefaa8a4ed5ecb02df2645dc7dc4239
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of external links and the nature of the heuristics indicate a likely attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=epson+event+manager PDF link annotation
    • http://zespolbahamas.pl/zdjecia/file/tiwizawogapu.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210915161857.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/65692259263.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/xepokisuxumula.pdfIn PDF document text
    • https://senegal4d.com/contents/files/65300095408.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c623476c1bd46f32890ef45ccaa8d6b2/99236136622.pdfIn PDF document text
    • http://berbun.com/user_img/file/758454625.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/sofajifas.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f2974617---nusobugedemibasamanojamix.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33379367621.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/besani.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/83574855361.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1188850257fc197216d1d56a6033b289/8871222721.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/7b8qt70cqsb7q26aedjc8q3ucl/35415343041.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210904063628.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/lumomikozizumamo.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210916020637.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367adf782e5---pozulovozizagibimugodevat.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/vajepuzuxan.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/mazoduzulemazinarebibevu.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/lovajizolorerakuguvojig.pdfIn PDF document text
    • http://xsteelstock.com/d/files/jodosupazujopi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea54d9a94---92723107990.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_off0000b2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C9 10508 bytes
SHA-256: 56f2874e7adedb38bbe2ebc35af05e318b6022d832f2cca0634bb66c648170a3
font_01_sfnt_off0000cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 16000 bytes
SHA-256: a20509137c5500493f534ea2d7cb5e3404e913e61e67d821d538d100821cd372
font_02_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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