Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a753dc8353cabff…

MALICIOUS

PDF

67.7 KB Created: 2021-09-29 02:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 83991fb1aa158bb4a6aaae108c3a95bf SHA-1: 122c046103d3d920713d51cec2cf0d84c402d51e SHA-256: 0a753dc8353cabff77515712feccec251e02dde8cd13cc7a4ee19bd125eea6cb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content or downloads. The heuristic 'PDF_IMAGE_LURE' indicates the document is designed to appear as an image, hiding clickable elements that likely lead to the identified URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://jar-ted.pl/file/pebugejatexagekoretawe.pdf In PDF document text
    • https://locktactyuma.com/userfiles/file/ratipox.pdfIn PDF document text
    • http://melabo.com/upload/files/67727530602.pdfIn PDF document text
    • http://hun777.hu/_user/file/95430961810.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/15653224997.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/47966880656.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/datix.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/51796815816.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/kovesovalarukuxofominoxo.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109020915569274.pdfIn PDF document text
    • http://keyday.ru/files/files/xamik.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/13402998428.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/xoxofelive.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/2b95c9df98eafa9f09079bb1b51b25a7/nakomogubelebodave.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137db4f59879---95733005181.pdfIn PDF document text
    • http://www.puhito.hu/uploads/92481641221.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/38136636479.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/37721494924.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/diparabumaruxor.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/45037464895.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/14469193788.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/78852783025.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/wobat.pdfIn PDF document text
    • http://tdbm.vn/upload/files/bolafuxokoxot.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379b111979b---vejefugatugijapedere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=custom+rom+xiaomi+mi+a2+litePDF 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_off0000ae87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE87 14020 bytes
SHA-256: c44220da354cdada1a915cefc3b4d560b9b49b635648c81f981af188441a2f26
font_01_sfnt_off0000d154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD154 10516 bytes
SHA-256: 3747d1117f9c08ed596ec8f2e4b987a9e0edd2cec3ab861e83ed4c1a9ecfb355
font_02_sfnt_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1