Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6d8377a8768991…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 03:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7fbcd4b33c830f2d3782af38967c04e6 SHA-1: 0504d99d01e18cb1206c441e43b15e79bb18c4ef SHA-256: 2a6d8377a876899159ad1b570c6615df81f16a72322e775ffd39595aae491519
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 domains or compromised CMS uploads, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://oniceh.ru/uplcv?utm_term=microeconomics+paul+krugman+5th+edition+pdf PDF link annotation
    • http://pro-customer.de/userfiles/file/mozibilazeboropave.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/1388602367.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/50160275189.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/xizifu.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/73525666283.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/16ad89eaf031eed3c263ab5037511326/xisiw.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/pusakavivemotaxizijenuj.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/bixomamogasikijateti.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210908_112855.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/54997881377.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/sewetedejukewugevitedon.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/vemexuroranunokozelavi.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109151548365888.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144bd59708d3---95257705271.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/489988823.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/41629944960.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6qhp090cooos5tvo7slh4rqr45/bozasujuzivotogusiw.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/84829526534.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/70270814173.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/mutidawiduzu.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/xozukoful.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d12fe2900---kawilizivaz.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/xexibepitenosobolinev.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/zoramipomikatomeboxul.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_off0000c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 17256 bytes
SHA-256: cd1759807ced71a33de8d8c63db466895e93965fcb68bbc15498c65eb403d0ac
font_01_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 11388 bytes
SHA-256: f3de18c8b8d76cc35d4b5fff458a095c3ccd26b6a6519454d72651eb0186e259