Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a2892fc1cf1301…

MALICIOUS

PDF

118.5 KB Created: 2021-07-01 21:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 58bdb9393823ce6c4642450956ff77e3 SHA-1: 003f6a9725d7265039c45b4e56981dfacf78134c SHA-256: 86a2892fc1cf130150f999bd58b1d6730b25981dccc2095821d0fdbbe6c20d89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863c8e47ea5---30536662164.pdf, are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://batiment-tunisie.com/userfiles/file/47144495539.pdf In PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/6111379111.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/2rmuaedq0jp4dctpqoe3hl8h11/vafoxebagaketuxu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160804521c4a2c---papilivodetisarubesugev.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a90b3c9150a---laledudaninomomesatiwusi.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/nokesiminerikugukedaxato.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607e931984d38---guvofinexebunogoz.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0636cca02---1044114201.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc4ec34de2---pifulugaxarurano.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/madubarulufogedev.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea9e44f6f7---jiripumi.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863c8e47ea5---30536662164.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/vavokinef.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/nidesobunonidoxovegob.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/f2827f0qtl4uo2v4i2rh2cm69r/12763761236.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/96630340123.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3ca110436---sejijubatokavomubizozedum.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ce40aa4cbb99f322b3bb5e8198bad85a/56335003741.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/vokurov.pdfIn PDF document text
    • https://jagominum.com/contents//files/25165043449.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e2f380a3b---23199900183.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/faveferozaliwelu.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/xomatimomipe.pdfIn PDF document text
    • https://cecprint.com/images/file/89724881631.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/84410717099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=methods+of+trade+protectionismPDF 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_off00016c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C7E 10832 bytes
SHA-256: 5055124c6d8616600cf1c5cb1cf3ddc9947f58317af9ca0e4c990a5b9c174e74
font_01_sfnt_off00018555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D67 17552 bytes
SHA-256: 88572d50ca5e6765ce143f68eb285331af8df36acc56d12e7adb1d7b644f766b