Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6acb8e4146c8e74…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 10:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a80aba8002a702c6942f07a5f68be823 SHA-1: 2266030e4d63b8e723eb9050be8b41a5d894a31d SHA-256: e6acb8e4146c8e7457eb2caa64fa10f061ae1bf86fa8e6b3c2ca9176502738f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristic findings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/welifipaw.pdf In PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/bbc8c855e701004c075ad4ca0ec8c624/rovodobaj.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/78177761635.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/dizij.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7b23ab495---75088700866.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/492e79d2b1420011e2374b284d73dafd/virute.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/pebexevefevujexu.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/58778415027.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/jupakibilosapu.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f906a3461b---girivopivupogezunejutoxul.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614f81023dce5---39077081198.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/jilawukukesarogonelarago.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/berirefa.pdfIn PDF document text
    • https://superpart.com/files/75776213376.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/64212433954.pdfIn PDF document text
    • https://trainova.com/userfiles/file/xinofoda.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d121b1ed17---38589049445.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/86111222058.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/logosilowugidezaruro.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/66074883110.pdfIn PDF document text
    • http://df-2.de/images/daten/file/povabasujaredupexubixowe.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109070353586481.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/noneluruvude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=house+flipper+android+1PDF link annotation
    • https://mediaget.com/userfiles/files/mefulijaroxugo.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_off0000b434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB434 15448 bytes
SHA-256: 9839e2c55b89f7f1997308d6e78747d5b9dae73c1fc82d31c39391def9b5d8ea
font_01_sfnt_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 10536 bytes
SHA-256: bf3c412c4b5eeae827db1995dc7ba7cc1e4685eaf375b6d0b7043994af86a4a2
font_02_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1