Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb07d307e8b7257…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 07:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cec6e47c157c72c6b854ce02fc8b870f SHA-1: 7859cc7f66aa814dd9c84526ff449ae444e1e89e SHA-256: 1fb07d307e8b7257aeeec312928eac874f3ee989c59e8cb3595110e9221723ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document functions as a link farm, directing users to multiple URLs hosted on compromised websites, ostensibly to download "physics for dummies". The presence of numerous external URIs and link farm heuristics suggests an attempt to distribute malicious content or phish for information. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099c832a03c5---wazaxo.pdf In PDF document text
    • http://aaaexpressac.com/userfiles/file/zeluvisuk.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021072813560973499.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/wabiromebibeguralifeloros.pdfIn PDF document text
    • http://djpress.pl/Image/files/99589974068.pdfIn PDF document text
    • http://totoumi.jp/upload/file/vumebavenine.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/moxejiwebarurez.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/zigonufabipelopukokosot.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160948f4f50d02---78288140577.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/2jtmrcsas73t7vfr9ecm76u6vujqibdn/linarogapifewipuxerut.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/96653515413.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/9947575313.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1875e0495dfeba77137dddae6e1451b5/2135129856.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/lakaju.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/tumifur.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/bemarik.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d994289099244ccc9b558f88ffcdf042/soxababoredug.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5c75bdcbe0be52db9297ad3adc066d7f/wolavanixitelaluzof.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/xivumefodutinibubojasofaz.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/xofut.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/viguxiwinijowodegajul.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/90445900905.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbea9e75a0---jeletedunenebatexamaboj.pdfIn PDF document text
    • https://mmszke.hu/files/file/10589223045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=physics+for+dummies+free+download+pdfPDF 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_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 17712 bytes
SHA-256: 2f60bd27d1c64d4e09a8af1b3b07d60b9f8773dedf97626c98bcf69bc286cf40
font_01_sfnt_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12751 11088 bytes
SHA-256: c3aba28c3417a6ef8eea604d52130b819e610f272c803f7f927449bc11f0dcf3

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