Malicious PDF — malware analysis report

Static analysis result for SHA-256 2abecb9038144f6c…

MALICIOUS

PDF

97.6 KB Created: 2021-09-08 15:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e4c16f075fed2a85df738e8a13bfaf5 SHA-1: 65054cd0c844c2b55316bc822ebcde04c68b7c20 SHA-256: 2abecb9038144f6c5b372b041d9806f62bf8697892eac1731e6e7dc4bb7e0061
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://uniondrygoods.com/fckeditor/userfiles/file/jazumigalozunekovu.pdf In PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/73569843402.pdfIn PDF document text
    • https://istanajp.com/contents/files/gedejikapoxugudobumizin.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/61364458347.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/43153714723.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f958109d892dd457b647c7b4a8b682b5/4948342236.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/46874402651.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/nabisafalizazuwutimazi.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/70828960722.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/gutetufuzuxon.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/25911384871.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a657be291---dajewug.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/mafokabutujekuwas.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/ridarudakofud.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613105b63dcd1---66181365712.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/16013542231.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/8293613155.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/bimonabenedogesovupuzab.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/biwigulejasozuw.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/xunasojolifudiwuti.pdfIn PDF document text
    • http://belst.by/upload/file/fiduwefojazukevibodege.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/gedafiziwubok.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/laxus.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/89297446810.pdfIn PDF document text
    • http://pnalog.ru/images/file/14770658720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=braving+trust+worksheetPDF 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_off00011751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11751 18820 bytes
SHA-256: 487d91435a144662ec72b8f090503eb7085a6152e734a2e9a1e7497285bc2223
font_01_sfnt_off000147fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147FC 10736 bytes
SHA-256: 887bfbd0e94db417e106e84f31946c591d86403714ed5e1af2756511ebc38762
font_02_sfnt_off000160c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1