Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab31f03eef1744a…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 08:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18e4e3f46ae1e8fd853f9b109fb5fb2f SHA-1: 37ff874e4713863a4d0fc8ece3c22f326cb2abe3 SHA-256: aab31f03eef1744a4e46080b158f072559de1f88a0fc61161d48c5c8cad2d72b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://carcable-bg.com/uploads/pictures/files/lizuwobunuko.pdf In PDF document text
    • http://ovstav.cz/app/webroot/files/files/gojogegu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161348e065640d---3841871719.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/pularovilabujarudugi.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/14029622858.pdfIn PDF document text
    • https://senfina.top/uploads/files/62400818075.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b2eef8eb387762aaeff83ed51da65632/29205649871.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/fawenewenituruvobidew.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/wukazuvanenidanugop.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/23906962735.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/70592385910.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/mawaxijewa.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/39327015262.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090708545973499.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/lemezojiwanosew.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f624c496373d5407e518203a9cc78395/mamuxekuwudisi.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/najuwimuwopijeruw.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/wupidesufam.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/44657843164.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/59799190526.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/49389114117.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/rotaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=nba+2k20+mycareer+locker+codesPDF 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_off0000ada1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 14228 bytes
SHA-256: bfd67a5ea571360bacd390cf8a65843de8f99c19acd06539832a5b3b57926e91
font_02_sfnt_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 10800 bytes
SHA-256: fa29ffe399b9483d80769c003ed73016569c635b28b7803ca7f5989ec35f0d79