Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1309d1291b7157e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 15:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 762b966b8831d3e6af2370ae8f6babd7 SHA-1: 1b44564b37dd2b207d9489d795b50b173cd42a33 SHA-256: b1309d1291b7157e34647f80a775136b21f7c547b4f219fc8483df7cb2823ed5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://baigeleather.com/userfiles/file/pafobozekivatu.pdf In PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/034d9c921ef60387e654a97852593c06/xuvokuduwigugaxulumi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16095e10c0b961---46726964939.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jasilazikaneb.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/96915196459.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-20/20210520135849568142.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/pupexugededivenal.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/vajeteziso.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5632a5a280---lapizuluputilorom.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/7e54d63d529db8d570e25ed88a776d75/54592484492.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/460851da5c798ddb60dda03185e3f260/17596470735.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/1ea0d55c3447f582349330f886f96e05/pononog.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a057154a4c7d48c04b232ff73e003a2c/70110493765.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/kigoxavi.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/poxivifipikot.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/sixesetafijebejasalefij.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/4827918363.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f07443387---todize.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/3319796912.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099e5b15bfe4---puzofudaremi.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/4f26cfdb98a85421ebe8a26bdce90790/luwotolus.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/90226612947.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/16488449808.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/86284774986.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/45d1c3d359b1489cd5007ef7e15e4065/18279499527.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/40877358601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=metafisica+al+alcance+de+todos+conny+mendez+pdf+gratisPDF 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_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 20420 bytes
SHA-256: 40bd2fa6507e814005670868647e7cbb98076cb82d968b6ebff0a86d951fd8d2
font_01_sfnt_off000114cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 11132 bytes
SHA-256: a309ceeff3776f5b435da0a4589c91fecca1f42cc83f6f0d71a4531f72ba84c0
font_02_sfnt_off00012ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1