Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7d187f7a061c5a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 15:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f55c29548747265174a014792a73989d SHA-1: ea88424e09a871d5f4303f909d89539c3aa33c2e SHA-256: 9b7d187f7a061c5a7604b8b4740cde43b3859f92bccfed9f32331019cd66c8b8
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 classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or scam campaign. The embedded URLs, such as https://pixomot.ru/uplcv?utm_term=tomorrow+when+the+war+began+book+pdf+download+free, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pixomot.ru/uplcv?utm_term=tomorrow+when+the+war+began+book+pdf+download+free PDF link annotation
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ddbac3kqstnkoqg404b9p7u1o4/pitatidovazigegez.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/luxomavebesubowopo.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/gagiwijip.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/28271376836.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/litagelugupezedepagumox.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/a857873eef072641786aaa7b9025804e/dakedabezatewewegod.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979cc6efd50---bopije.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608463655e465---93793649516.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/gejerad.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/57670562507.pdfIn PDF document text
    • https://jjpremiers.com/files/juvozetid.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9939beeca---zijapuzolotivupebaza.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/36137154393.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/73957602685.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/41222274233.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/s6vs8cfbmelqakkacakj495l3j/15218833144.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/65806214068.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/rexudonemolakix.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/55895477088.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/85014165277.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/lofozepapob.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/wejupawokedegisigexokawan.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d44019acc9.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/42752908713.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c390f69cf1d---69749304508.pdfIn PDF document text
    • http://ippon.lv/uploads/File/diwapixinanevimanapaxi.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_off0000c837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC837 10964 bytes
SHA-256: ef95726666a2f9b57ddec2ad2a774e217a990b86e5dfa5d105e62bfc9469da43
font_01_sfnt_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 17316 bytes
SHA-256: 4400c4c3d157ceb1dce3bcd45af3b2f2d413558f9ff393470f5505a553d08d94
font_02_sfnt_off00010de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1