Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6b6b04dcd07710…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 21:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d1892046ee03f127e5bb057de3930d2 SHA-1: 941fef773d0f2088f4928309436c1e928883019c SHA-256: 4a6b6b04dcd077108448051a1e67ab8bbb5041f8177e3987db4f728174777747
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4637

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=simcity+4+codes PDF link annotation
    • http://cosmoscm.com/contents/files/xalugotivusajofirisezif.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/morelevafoxizosetava.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/pawonudexafav.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/davewevemamopubusipusu.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/tovewob.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/4170528362.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/18974348478.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/5a94b0da87fd769218590a9680c658df/rowutabavog.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/sevarasovuvevunolozepena.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/65310090006.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c022c16b5ff6d93b7164ee340f6398ea/81832901184.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/d17vr7j9grmp1javq69refit0r/24250931376.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/vadabu.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/36942538010.pdfIn PDF document text
    • http://sdes.in/uploads/sepowedel.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/45875081466.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/86643911862.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/22650666018.pdfIn PDF document text
    • https://subded.org/userfiles/file/71243850549.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/wexidonekusiduzotu.pdfIn PDF document text
    • http://abworder.com/uploads/files/pupujebibenuxis.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/30367743032.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/76645336865.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/48533043590.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/38485670608.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/92236880081.pdfIn 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_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 18492 bytes
SHA-256: f481f943f7ef101f55b28fb56d9359bc60985c1cc75e0dbc18cadc19ff49f231
font_01_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 10384 bytes
SHA-256: c8fb643faa9cd9d5a7105301f0b1c216664536fc68f643418a103326365f3f6d
font_02_sfnt_off00012b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1