Malicious PDF — malware analysis report

Static analysis result for SHA-256 276ad079e3ce1c33…

MALICIOUS

PDF

96.2 KB Created: 2021-06-29 05:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8b10cf7f3c2f2a006a1ab601125808a0 SHA-1: 6966f5489dc0678e6cb5105650c57ce46497d881 SHA-256: 276ad079e3ce1c33b6e71dd52500268bb8e279eff2c3b90c6fa38ce4f977ee85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The primary function seems to be acting as a link farm, redirecting users to potentially malicious content, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://chcial.ru/uplcv?utm_term=busiest+heliport+in+the+world PDF link annotation
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/dde38b5e64b06c6637ae3976350907bd/69859713972.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94ad9f7cd---55780767350.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/43239554398.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29551385772.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/db85seeo5s1g16j3ab1121dp0l/32995579627.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700c0ade412---dagoratuzevilidurizigoza.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/rqkfpvgbrmenp8g13v5l7spe2c/nozodebefami.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/34cd42ced6cabcee981f53e1dd8ee47e/52865455895.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/l77osqn87p6704ra9vnsf4ravd/sofibozovuwezopijo.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/xelosezebar.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/8238713850.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/35211705820.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/70n2m069l0ntviec80fahnbm56/39455925340.pdfIn PDF document text
    • http://erictex.com/ufiles/files/76596621927.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/da2e761fea80d258913ca48d2e42cbf0/xakabagamoxolekegux.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/jetotegile.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950bf9ab0b9---lugadinujisizog.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/dbedf9b1639b74307157f08898c18b6a/58624564021.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096eb7399f78---76127398566.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/56004130459.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1440b74f27cffcf01bd0ff05c0750c96/kovipusaluzu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e3d74f166f772fc7277974364e32c7d8/88349678958.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91455caf3---84995806341.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/k29dg3ut95g0aupvom3u0nsco4/46219329056.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d12cef00322c08e9c88db59136b43792/mopazuwalatozoseb.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_off000115e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E9 10568 bytes
SHA-256: b5f0ec75828f442205478633ed569b9fed2d0b1476600f9f085acb8ca9d26ecd
font_01_sfnt_off00012e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E05 17340 bytes
SHA-256: ab7433470328f993adcd4f413e437323fab4a9d5d841dec8da69fc40e8d668ca
font_02_sfnt_off00015b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1